efi_loader: image_loader: add a missing digest verification for signed PE image

At the last step of PE image authentication, an image's hash value must be
compared with a message digest stored as the content (of SpcPeImageData type)
of pkcs7's contentInfo.

Fixes: commit 4540dabdcaca ("efi_loader: image_loader: support image authentication")
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index e2a1a5a..e3f2402 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -366,6 +366,7 @@
 	select X509_CERTIFICATE_PARSER
 	select PKCS7_MESSAGE_PARSER
 	select PKCS7_VERIFY
+	select MSCODE_PARSER
 	select EFI_SIGNATURE_SUPPORT
 	help
 	  Select this option to enable EFI secure boot support.