selftests/memfd: Run test on all architectures

Remove the dependence on x86 to run the memfd test. Verfied on 32-bit powerpc.
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/memfd/Makefile

-uname_M := $(shell uname -m 2>/dev/null || echo not)
-ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/i386/)
-ifeq ($(ARCH),i386)
-	ARCH := x86
-endif
-ifeq ($(ARCH),x86_64)
-	ARCH := x86
-endif
-
 CFLAGS += -D_FILE_OFFSET_BITS=64
-CFLAGS += -I../../../../arch/x86/include/generated/uapi/
-CFLAGS += -I../../../../arch/x86/include/uapi/
 CFLAGS += -I../../../../include/uapi/
 CFLAGS += -I../../../../include/
 
 all:
-ifeq ($(ARCH),x86)
 	gcc $(CFLAGS) memfd_test.c -o memfd_test
-else
-	echo "Not an x86 target, can't build memfd selftest"
-endif
 
 run_tests: all
-ifeq ($(ARCH),x86)
 	gcc $(CFLAGS) memfd_test.c -o memfd_test
-endif
 	@./memfd_test || echo "memfd_test: [FAIL]"
 
 build_fuse:
-ifeq ($(ARCH),x86)
 	gcc $(CFLAGS) fuse_mnt.c `pkg-config fuse --cflags --libs` -o fuse_mnt
 	gcc $(CFLAGS) fuse_test.c -o fuse_test
-else
-	echo "Not an x86 target, can't build memfd selftest"
-endif
 
 run_fuse: build_fuse
 	@./run_fuse_test.sh || echo "fuse_test: [FAIL]"