efi/x86: Remove unused variables

Commit

  987053a3 ("efi/x86: Move command-line initrd loading to efi_main")

made the ramdisk_addr/ramdisk_size variables in efi_pe_entry unused, but
neglected to delete them.

Delete these unused variables.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>