armv4_5: fix segmentation fault in command 'arm reg'

Commit fed7131049 ("armv4_5: support weirdo ARMv6 secure monitor
mode") introduces the secure mode 28 of ARMv6 as a synonymous of
mode 22 (MON), but does not add it in the switch/case in command
'arm reg'.
When command 'arm reg' scans the array arm_mode_data[] on targets
without secure modes, it does not detect the new secure mode as
not supported by the architecture, thus triggers a segmentation
fault when it try to read the register's value from unallocated
memory.
Issue detected with target arm926ejs.

Add the new mode in the switch/case and treat it as the mode MON.

Change-Id: I2b72cc558e097879a7ee6ea601200bfda6b60270
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Fixes: fed7131049 ("armv4_5: support weirdo ARMv6 secure monitor mode")
Reviewed-on: http://openocd.zylin.com/5941
Tested-by: jenkins
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>

src/target/armv4_5.c

@@ -869,6 +869,7 @@ COMMAND_HANDLER(handle_armv4_5_reg_command)
 					continue;
 			/* FALLTHROUGH */
 			case ARM_MODE_MON:
+			case ARM_MODE_1176_MON:
 				if (arm->core_type != ARM_CORE_TYPE_SEC_EXT
 					&& arm->core_type != ARM_CORE_TYPE_VIRT_EXT)
 					continue;