efi_selftest: enable all UEFI unit tests on the sandbox

As we can build relocation code for the sandbox now we should enable the
unit tests that had to be disabled up to now.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_selftest/Makefile b/lib/efi_selftest/Makefile
index 8348014..487cb4c 100644
--- a/lib/efi_selftest/Makefile
+++ b/lib/efi_selftest/Makefile
@@ -5,6 +5,9 @@
 # This file only gets included with CONFIG_EFI_LOADER set, so all
 # object inclusion implicitly depends on it
 
+asflags-y += -DHOST_ARCH="$(HOST_ARCH)"
+ccflags-y += -DHOST_ARCH="$(HOST_ARCH)"
+
 CFLAGS_efi_selftest_miniapp_exit.o := $(CFLAGS_EFI) -Os -ffreestanding
 CFLAGS_REMOVE_efi_selftest_miniapp_exit.o := $(CFLAGS_NON_EFI)
 CFLAGS_efi_selftest_miniapp_return.o := $(CFLAGS_EFI) -Os -ffreestanding
@@ -55,8 +58,8 @@
 endif
 
 # TODO: As of v2019.10 the relocation code for the EFI application cannot
-# be built on ARMv7-M and Sandbox.
-ifeq ($(CONFIG_SANDBOX)$(CONFIG_CPU_V7M),)
+# be built on ARMv7-M.
+ifeq ($(CONFIG_CPU_V7M),)
 
 obj-y += \
 efi_selftest_exception.o \