[U-Boot] [U-Boot, 4/4] efi_loader: indent entry/exit prints to show nesting level

[Alexander Graf]

> This should make it easier to see when a callback back to UEFI world
> calls back in to the u-boot world, and generally match up EFI_ENTRY()
> and EFI_EXIT() calls.
> 
> Signed-off-by: Rob Clark <robdclark at gmail.com>

Thanks, applied to efi-next

Alex