Revert "[2.0.x] Switch to PIO managed L6470 library (#11288)" (#11290)

This reverts commit a26fdf6b68.

platformio.ini

@@ -35,7 +35,7 @@ lib_deps =
   https://github.com/teemuatlut/TMC2208Stepper/archive/v0.1.1.zip
   Adafruit NeoPixel@1.1.3
   https://github.com/lincomatic/LiquidTWI2/archive/30aa480.zip
-  Arduino-L6470
+  https://github.com/ameyer/Arduino-L6470/archive/master.zip
   https://github.com/trinamic/TMC26XStepper/archive/c1921b4.zip
 
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