riscv: revert Complete efi header for RV32/64

riscv: revert Complete efi header for RV32/64

EDK II refuses to load the EFI binaries created by U-Boot.
The reason is an incorrect PE-COFF header. The number of
data directories does not match NumberOfRvaAndSizes.
This leads to a failed consistency check in
PeCoffLoaderGetPeHeader():

    SizeOfOptionalHeader - HeaderWithoutDataDir) !=
    NumberOfRvaAndSizes * sizeof(DATA_DIRECTORY))

Fixes: 9afaeec6ef8b ("riscv: Complete efi header for RV32/64")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>