string literals in efi_loader code

Heinrich,

You started to use u"..." literals in efi_loader code in commit 99bfab8b5832("efi_loader: identify PK, KEK, db, dbx correctly"), but there are still lots of L"..." literals seen. Do you want to replace all the 'L' to 'u'? I think that mixing both usages would cause confusion. What is your policy? (I know -fshort-wchar is still on in Makefile.)

-Takahiro Akashi