kern/efi/sb: Add chainloaded image as shim's verifiable object

kern/efi/sb: Add chainloaded image as shim's verifiable object

While attempting to dual boot Microsoft Windows with UEFI chainloader,
it failed with below error when UEFI Secure Boot was enabled:

  error ../../grub-core/kern/verifiers.c:119:verification requested but
  nobody cares: /EFI/Microsoft/Boot/bootmgfw.efi.

It is a regression, as previously it worked without any problem.

It turns out chainloading PE image has been locked down by commit
578c95298 (kern: Add lockdown support). However, we should consider it
as verifiable object by shim to allow booting in UEFI Secure Boot mode.
The chainloaded PE image could also have trusted signature created by
vendor with their pubkey cert in db. For that matters it's usage should
not be locked down under UEFI Secure Boot, and instead shim should be
allowed to validate a PE binary signature before running it.

Fixes: 578c95298 (kern: Add lockdown support)
Signed-off-by: Michael Chang <mchang@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>