target: aarch64: add support for 32 bit MON mode

Extend the existing code to support Monitor mode in AArch32.

Change-Id: Ia43df98d1497baac48aea67b92d81344c24f0635
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8169
Tested-by: jenkins

src/target/aarch64.c

@@ -93,6 +93,7 @@ static int aarch64_restore_system_control_reg(struct target *target)
 		case ARM_MODE_HYP:
 		case ARM_MODE_UND:
 		case ARM_MODE_SYS:
+		case ARM_MODE_MON:
 			instr = ARMV4_5_MCR(15, 0, 0, 1, 0, 0);
 			break;
 
@@ -172,6 +173,7 @@ static int aarch64_mmu_modify(struct target *target, int enable)
 	case ARM_MODE_HYP:
 	case ARM_MODE_UND:
 	case ARM_MODE_SYS:
+	case ARM_MODE_MON:
 		instr = ARMV4_5_MCR(15, 0, 0, 1, 0, 0);
 		break;
 
@@ -1043,6 +1045,7 @@ static int aarch64_post_debug_entry(struct target *target)
 	case ARM_MODE_HYP:
 	case ARM_MODE_UND:
 	case ARM_MODE_SYS:
+	case ARM_MODE_MON:
 		instr = ARMV4_5_MRC(15, 0, 0, 1, 0, 0);
 		break;