efi_loader: enable EFI_SET_TIME on sandbox and QEMU ARM

Enable EFI_SET_TIME on the sandbox and QEMU ARM to ensure that we compile
and test the relevant code.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index 29ea14b..7fd3a3c 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -88,6 +88,7 @@
 config EFI_SET_TIME
 	bool "SetTime() runtime service"
 	depends on EFI_GET_TIME
+	default y if ARCH_QEMU || SANDBOX
 	default n
 	help
 	  Provide the SetTime() runtime service at boottime. This service