efi: rt-wrapper: Add missing include

mainline inclusion
from mainline-v6.2-rc4
commit 18bba184
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I67RIP
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=18bba1843fc7f264f58c9345d00827d082f9c558



--------------------------------

Add the missing #include of asm/assembler.h, which is where the ldr_l
macro is defined.

Fixes: ff7a1679 ("arm64: efi: Execute runtime services from a dedicated stack")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ding Hui <dinghui@sangfor.com.cn>