Adding a new platform: renesas rz

[Michele Bisogno]

Hi Matt,

> Does the Renesas/RZ U-boot have EFI support enabled ('bootefi' command)?
> Could you try an armsr/armv8 image and see if it boots?

I've just tried:

=> fatload mmc 1:1 0x48000000 openwrt-armsr-armv8-generic-initramfs-kernel.bin
32223744 bytes read in 2669 ms (11.5 MiB/s)
=> bootefi 0x48000000
Scanning disk sd at 11c00000.blk...
Scanning disk sd at 11c10000.blk...
Found 13 disks
No EFI system partition
Booting /openwrt-armsr-armv8-generic-initramfs-kernel.bin
EFI stub: Booting Linux Kernel...
EFI stub: EFI_RNG_PROTOCOL unavailable
EFI stub: ERROR: FIRMWARE BUG: kernel image not aligned on 64k boundary
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services...

And it hangs here.
I suppose there are still some missing bits in u-boot to make it
happen. I'm investigating.

Kind regards,
Michele