fs: ext4: default KUNIT_* fragments to KUNIT_ALL_TESTS

This makes it easier to enable all KUnit fragments.

Adding 'if !KUNIT_ALL_TESTS' so individual tests can not be turned off.
Therefore if KUNIT_ALL_TESTS is enabled that will hide the prompt in
menuconfig.

Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

fs/ext4/Kconfig

@@ -103,9 +103,10 @@ config EXT4_DEBUG
 		echo 1 > /sys/module/ext4/parameters/mballoc_debug
 
 config EXT4_KUNIT_TESTS
-	tristate "KUnit tests for ext4"
+	tristate "KUnit tests for ext4" if !KUNIT_ALL_TESTS
 	select EXT4_FS
 	depends on KUNIT
+	default KUNIT_ALL_TESTS
 	help
 	  This builds the ext4 KUnit tests.