openocd: remove CamelCase symbols *xPSR*

We have left the camelcase symbols *xPSR* for some time, to avoid
any conflict with possibly pending patches in gerrit.
With the approaching v0.12.0-rc1, it's time to revisit it.
The patches in gerrit that conflict with this rename are all not
merge-able due to conflicts or due to negative review.

Drop these CamelCase symbols.

Change-Id: Ifbac4c1df9cc55994e024971a2aaebeed2ea4ed3
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7155
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/target/armv7m.h

@@ -46,7 +46,7 @@ enum {
 	ARMV7M_REGSEL_R14,
 	ARMV7M_REGSEL_PC = 15,
 
-	ARMV7M_REGSEL_xPSR = 16,
+	ARMV7M_REGSEL_XPSR = 16,
 	ARMV7M_REGSEL_MSP,
 	ARMV7M_REGSEL_PSP,
 
@@ -124,7 +124,7 @@ enum {
 	ARMV7M_R14 = ARMV7M_REGSEL_R14,
 	ARMV7M_PC = ARMV7M_REGSEL_PC,
 
-	ARMV7M_xPSR = ARMV7M_REGSEL_xPSR,
+	ARMV7M_XPSR = ARMV7M_REGSEL_XPSR,
 	ARMV7M_MSP = ARMV7M_REGSEL_MSP,
 	ARMV7M_PSP = ARMV7M_REGSEL_PSP,
 
@@ -199,7 +199,7 @@ enum {
 	/* for convenience add registers' block delimiters */
 	ARMV7M_LAST_REG,
 	ARMV7M_CORE_FIRST_REG = ARMV7M_R0,
-	ARMV7M_CORE_LAST_REG = ARMV7M_xPSR,
+	ARMV7M_CORE_LAST_REG = ARMV7M_XPSR,
 	ARMV7M_FPU_FIRST_REG = ARMV7M_D0,
 	ARMV7M_FPU_LAST_REG = ARMV7M_FPSCR,
 	ARMV8M_FIRST_REG = ARMV8M_MSP_NS,