SKR Pro V1.1 StallGuard pins

[AlexanderAmelkin]

In SKR Pro V1.1 the DIAG1 pin of stepper drivers
is internally wired to MIN endstops.
Delta printers however require homing to MAX.
This commit swaps MIN and MAX endstop pins for SKR Pro V1.1
if DELTA is selected and StallGuard is in use. The latter
is considered true if any StallGuard-capable stepper
is configured for any axis.

Resolves bigtreetech/BIGTREETECH-SKR-PRO-V1.1#103

[thisiskeithb]

The SKR 1.3 & 1.4 did something similar to remap StallGuard pins:

Marlin/Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_4.h

Lines 57 to 80 in c834b31

	//
	// Limit Switches
	//
	#if X_STALL_SENSITIVITY
	#define X_STOP_PIN X_DIAG_PIN
	#if X_HOME_DIR < 0
	#define X_MAX_PIN P1_26 // E0DET
	#else
	#define X_MIN_PIN P1_26 // E0DET
	#endif
	#else
	#define X_STOP_PIN P1_29 // X-STOP
	#endif
	#if Y_STALL_SENSITIVITY
	#define Y_STOP_PIN Y_DIAG_PIN
	#if Y_HOME_DIR < 0
	#define Y_MAX_PIN P1_25 // E1DET
	#else
	#define Y_MIN_PIN P1_25 // E1DET
	#endif
	#else
	#define Y_STOP_PIN P1_28 // Y-STOP
	#endif

[thinkyhead]

I've updated this with the standard handling. This causes Marlin to choose the appropriate DIAG pin whenever StallGuard is used on an axis, whether that's min or max. And then the "other" endstop pin for that axis is swapped over, so it can be referenced at some later points under the "other endstop" name. At this time we don't have a concept of E endstops, so those are just assigned to the other XYZ.