[U-Boot] [U-Boot, v2, 6/6] riscv: efi: Generate Microsoft PE format compliant images

[Alexander Graf]

> Per Microsoft PE Format documentation [1], PointerToSymbolTable and
> NumberOfSymbols should be zero for an image in the COFF file header.
> Currently the COFF file header is hardcoded on RISC-V and these two
> members are not zero.
> 
> This updates the hardcoded structure to clear these two members, as
> well as setting the flag IMAGE_FILE_LOCAL_SYMS_STRIPPED so that we
> can generate compliant *.efi images.
> 
> [1] https://docs.microsoft.com/zh-cn/windows/desktop/Debug/pe-format
> 
> Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
> Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>

Thanks, applied to efi-next

Alex