drivers: stepper: adi_tmc: position handling support

Add definition for handling position signedness.

Signed-off-by: Dipak Shetty <[email protected]>

Author: dipakgmx

include/zephyr/drivers/stepper/stepper_trinamic.h

@@ -55,6 +55,7 @@ extern "C" {
 #define TMC_RAMP_IHOLDDELAY_MAX GENMASK(3, 0)
 #define TMC_RAMP_IHOLDDELAY_MIN 0
 #define TMC_RAMP_VACTUAL_SHIFT  22
+#define TMC_RAMP_XACTUAL_SHIFT  31
 
 /* TMC50XX specific */
 #define TMC_RAMP_VCOOLTHRS_MAX  GENMASK(22, 0)