Print details of the new kexec image loaded.

Based on the original code from
commit 221f2c77 ("arm64/kexec: Add pr_debug output")
Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14614/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>