efi_loader: enable RNG if DM_RNG is enabled

Enable EFI_RNG_PROTOCOL by default if DM_RNG is set.
Signed-off-by: NPeter Robinson <pbrobinson@gmail.com>
Acked-by: NSughosh Ganu <sughosh.ganu@linaro.org>
Remove superfluous 'if DM_RNG'
Reviewed-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>

lib/efi_loader/Kconfig

@@ -126,6 +126,7 @@ config EFI_GRUB_ARM32_WORKAROUND
 config EFI_RNG_PROTOCOL
 	bool "EFI_RNG_PROTOCOL support"
 	depends on DM_RNG
+	default y
 	help
 	  Provide a EFI_RNG_PROTOCOL implementation using the hardware random
 	  number generator of the platform.