samples/tests: littlefs: tag littlefs samples/tests

Tag with required module name to make the tests run when the module has
changed.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

samples/subsys/fs/littlefs/sample.yaml

@@ -1,5 +1,9 @@
 sample:
   name: littlefs filesystem sample
+common:
+  tags:
+    - filesystem
+    - littefs
 tests:
   sample.filesystem.littlefs:
     build_only: true
@@ -15,7 +19,6 @@ tests:
       - mimxrt1160_evk_cm7
       - lpcxpresso55s69_cpu0
       - mr_canhubk3
-    tags: filesystem
     integration_platforms:
       - nrf52840dk_nrf52840
   sample.filesystem.littlefs.nrf52840dk_spi:

tests/subsys/fs/littlefs/testcase.yaml

@@ -1,5 +1,7 @@
 common:
-  tags: filesystem
+  tags:
+    - filesystem
+    - littlefs
   platform_allow:
     - nrf52840dk_nrf52840
     - native_posix