efi: libstub: fix type of fdt 32 and 64bit variables

efi: libstub: fix type of fdt 32 and 64bit variables

In update_fdt_memmap() an update_fdt() the fdt values should be
of the fd32_t and fdt64_t types. Make the relevant changes to
remove the following sparse warnings:

drivers/firmware/efi/libstub/fdt.c:97:19: warning: incorrect type in assignment (different base types)
drivers/firmware/efi/libstub/fdt.c:97:19:    expected unsigned long long [usertype] fdt_val64
drivers/firmware/efi/libstub/fdt.c:97:19:    got restricted __be64 [usertype]
drivers/firmware/efi/libstub/fdt.c:157:19: warning: incorrect type in assignment (different base types)
drivers/firmware/efi/libstub/fdt.c:157:19:    expected unsigned long long [usertype] fdt_val64
drivers/firmware/efi/libstub/fdt.c:157:19:    got restricted __be64 [usertype]
drivers/firmware/efi/libstub/fdt.c:163:19: warning: incorrect type in assignment (different base types)
drivers/firmware/efi/libstub/fdt.c:163:19:    expected unsigned int [usertype] fdt_val32
drivers/firmware/efi/libstub/fdt.c:163:19:    got restricted __be32 [usertype]
drivers/firmware/efi/libstub/fdt.c:169:19: warning: incorrect type in assignment (different base types)
drivers/firmware/efi/libstub/fdt.c:169:19:    expected unsigned int [addressable] [usertype] fdt_val32
drivers/firmware/efi/libstub/fdt.c:169:19:    got restricted __be32 [usertype]
drivers/firmware/efi/libstub/fdt.c:175:19: warning: incorrect type in assignment (different base types)
drivers/firmware/efi/libstub/fdt.c:175:19:    expected unsigned int [addressable] [usertype] fdt_val32
drivers/firmware/efi/libstub/fdt.c:175:19:    got restricted __be32 [usertype]

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>