coredump: arm: Capture callee registers during k_panic() / k_oops

Ensure callee registers included in coredump.
Push callee registers onto stack and pass as param to
z_do_kernel_oops for CONFIG_ARMV7_M_ARMV8_M_MAINLINE
when CONFIG_EXTRA_EXCEPTION_INFO enabled.

Signed-off-by: Mark Holden <mholden@fb.com>