[U-Boot] [U-Boot, 1/5] efi_loader: Allow boards to implement get_time and reset_system

[Alexander Graf]

> EFI allows an OS to leverage firmware drivers while the OS is running. In the
> generic code we so far had to stub those implementations out, because we would
> need board specific knowledge about MMIO setups for it.
> 
> However, boards can easily implement those themselves. This patch provides the
> framework so that a board can implement its own versions of get_time and
> reset_system which would actually do something useful.
> 
> While at it we also introduce a simple way for code to reserve MMIO pointers
> as runtime available.
> 
> Signed-off-by: Alexander Graf <agraf at suse.de>

Thanks, applied to