arch: arm: push ssf to thread privileged stack to complete stack frame
arch: arm: push ssf to thread privileged stack to complete stack frame

Pushes the seventh argument named ssf to thread's privileged
stack to follow below syscall prototype.

uintptr_t z_mrsh_xx(uintptr_t arg0, uintptr_t arg1, uintptr_t arg2,
		    uintptr_t arg3, uintptr_t arg4, void *more, void *ssf)

Fixes: #29386.

Signed-off-by: Wentong Wu <a92ffab6ab5ff780cf36418e13a69a97399df0f5@intel.com>

nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,Vudentz/zephyr,Vudentz/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,finikorg/zephyr,nashif/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,Vudentz/zephyr