efi: Rename efi_guid_unparse to efi_guid_to_str

Call it what it does - "unparse" is plain-misleading.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>

diff --cc block/partitions/efi.c
Simple merge

diff --cc drivers/firmware/efi/efi.c
Simple merge

diff --cc drivers/firmware/efi/efivars.c
Simple merge

diff --cc fs/efivarfs/super.c
Simple merge

diff --cc include/linux/efi.h
Simple merge