ANDROID: Make incfs selftests pass

Fixed incfs_test build errors
Fixed Kconfig errors
Readded .gitignore

Test: With just enabling CONFIG_INCREMENTAL_FS, both defconfig and
cuttlefish_defconfig build and incfs_test runs and passes

Bug: 133435829
Change-Id: Id3247ffcc63a095f66dcedf554017a06c5a9ce4a
Signed-off-by: Paul Lawrence <paullawrence@google.com>

fs/incfs/Kconfig

@@ -4,6 +4,7 @@ config INCREMENTAL_FS
 	select DECOMPRESS_LZ4
 	select CRC32
 	select CRYPTO
+	select CRYPTO_RSA
 	select CRYPTO_SHA256
 	select X509_CERTIFICATE_PARSER
 	select ASYMMETRIC_KEY_TYPE

tools/testing/selftests/filesystems/incfs/.gitignore

@@ -0,0 +1 @@
+incfs_test

tools/testing/selftests/filesystems/incfs/Makefile

@@ -5,6 +5,8 @@ CFLAGS += -I../../../../include/uapi/
 CFLAGS += -I../../../../lib
 
 EXTRA_SOURCES := utils.c
+CFLAGS += $(EXTRA_SOURCES)
+
 TEST_GEN_PROGS := incfs_test
 
 include ../../lib.mk

tools/testing/selftests/filesystems/incfs/incfs_test.c

@@ -2398,7 +2398,9 @@ int main(int argc, char *argv[])
 	};
 #undef MAKE_TEST
 
-	ksft_set_plan(ARRAY_SIZE(cases));
+	/* Bring back for kernel 5.x */
+	/* ksft_set_plan(ARRAY_SIZE(cases)); */
+
 	for (i = 0; i < ARRAY_SIZE(cases); ++i) {
 		ksft_print_msg("Running %s\n", cases[i].name);
 		if (cases[i].pfunc(mount_dir) == TEST_SUCCESS)