Onboard (always-on) pullups support (#16144)

Marlin/src/inc/SanityCheck.h

   #if ENABLED(BLTOUCH)
     #if BLTOUCH_DELAY < 200
       #error "BLTOUCH_DELAY less than 200 is unsafe and is not supported."
-    #elif DISABLED(BLTOUCH_SET_5V_MODE) && NONE(ENDSTOPPULLUPS, ENDSTOPPULLUP_ZMIN, ENDSTOPPULLUP_ZMIN_PROBE)
+    #elif DISABLED(BLTOUCH_SET_5V_MODE) && NONE(ONBOARD_ENDSTOPPULLUPS, ENDSTOPPULLUPS, ENDSTOPPULLUP_ZMIN, ENDSTOPPULLUP_ZMIN_PROBE)
       #error "BLTOUCH without BLTOUCH_SET_5V_MODE requires ENDSTOPPULLUPS, ENDSTOPPULLUP_ZMIN or ENDSTOPPULLUP_ZMIN_PROBE."
     #endif
   #endif
 
   #if ENABLED(DELTA) && !BOTH(STEALTHCHOP_XY, STEALTHCHOP_Z)
     #error "SENSORLESS_HOMING on DELTA currently requires STEALTHCHOP_XY and STEALTHCHOP_Z."
-  #elif X_SENSORLESS && X_HOME_DIR < 0 && DISABLED(ENDSTOPPULLUPS, ENDSTOPPULLUP_XMIN)
+  #elif X_SENSORLESS && X_HOME_DIR < 0 && NONE(ONBOARD_ENDSTOPPULLUPS, ENDSTOPPULLUPS, ENDSTOPPULLUP_XMIN)
     #error "SENSORLESS_HOMING requires ENDSTOPPULLUP_XMIN (or ENDSTOPPULLUPS) when homing to X_MIN."
-  #elif X_SENSORLESS && X_HOME_DIR > 0 && DISABLED(ENDSTOPPULLUPS, ENDSTOPPULLUP_XMAX)
+  #elif X_SENSORLESS && X_HOME_DIR > 0 && NONE(ONBOARD_ENDSTOPPULLUPS, ENDSTOPPULLUPS, ENDSTOPPULLUP_XMAX)
     #error "SENSORLESS_HOMING requires ENDSTOPPULLUP_XMAX (or ENDSTOPPULLUPS) when homing to X_MAX."
-  #elif Y_SENSORLESS && Y_HOME_DIR < 0 && DISABLED(ENDSTOPPULLUPS, ENDSTOPPULLUP_YMIN)
+  #elif Y_SENSORLESS && Y_HOME_DIR < 0 && NONE(ONBOARD_ENDSTOPPULLUPS, ENDSTOPPULLUPS, ENDSTOPPULLUP_YMIN)
     #error "SENSORLESS_HOMING requires ENDSTOPPULLUP_YMIN (or ENDSTOPPULLUPS) when homing to Y_MIN."
-  #elif Y_SENSORLESS && Y_HOME_DIR > 0 && DISABLED(ENDSTOPPULLUPS, ENDSTOPPULLUP_YMAX)
+  #elif Y_SENSORLESS && Y_HOME_DIR > 0 && NONE(ONBOARD_ENDSTOPPULLUPS, ENDSTOPPULLUPS, ENDSTOPPULLUP_YMAX)
     #error "SENSORLESS_HOMING requires ENDSTOPPULLUP_YMAX (or ENDSTOPPULLUPS) when homing to Y_MAX."
-  #elif Z_SENSORLESS && Z_HOME_DIR < 0 && DISABLED(ENDSTOPPULLUPS, ENDSTOPPULLUP_ZMIN)
+  #elif Z_SENSORLESS && Z_HOME_DIR < 0 && NONE(ONBOARD_ENDSTOPPULLUPS, ENDSTOPPULLUPS, ENDSTOPPULLUP_ZMIN)
     #error "SENSORLESS_HOMING requires ENDSTOPPULLUP_ZMIN (or ENDSTOPPULLUPS) when homing to Z_MIN."
-  #elif Z_SENSORLESS && Z_HOME_DIR > 0 && DISABLED(ENDSTOPPULLUPS, ENDSTOPPULLUP_ZMAX)
+  #elif Z_SENSORLESS && Z_HOME_DIR > 0 && NONE(ONBOARD_ENDSTOPPULLUPS, ENDSTOPPULLUPS, ENDSTOPPULLUP_ZMAX)
     #error "SENSORLESS_HOMING requires ENDSTOPPULLUP_ZMAX (or ENDSTOPPULLUPS) when homing to Z_MAX."
   #elif X_SENSORLESS && X_HOME_DIR < 0 && X_MIN_ENDSTOP_INVERTING != X_ENDSTOP_INVERTING
     #if X_ENDSTOP_INVERTING

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_3.h

   #define Z_MAX_PIN          P1_25   // Z_MIN
 #endif
 
+#define ONBOARD_ENDSTOPPULLUPS     // Board has built-in pullups
+
 //
 // Servos
 //

Marlin/src/pins/lpc1768/pins_RAMPS_RE_ARM.h

 #define Y_MAX_PIN          P1_27   // (15) 10k pullup to 3.3V, 1K series
 #define Z_MIN_PIN          P1_29   // (18) 10k pullup to 3.3V, 1K series
 #define Z_MAX_PIN          P1_28   // (19) 10k pullup to 3.3V, 1K series
+#define ONBOARD_ENDSTOPPULLUPS     // Board has built-in pullups
 
 //
 // Steppers