gbl: add kernel commandline fixup protocol

Starts the GBL_EFI_OS_CONFIGURATION_PROTOCOL, with the kernel
commandline fixup function only. This is going to be a fairly
complicated protocol so the other functions will be added in their own
CLs.

Bug: b/353272981
Change-Id: I35ea9a117e3cc5acee277247134e8dda3e6634cd