tests: lib: move time testsuite to c_lib

Presumably the time testsuite was separate from the c library set of
testsuites because it had a depedency on POSIX.

Since that dependency no longer exists, colocate the time testsuite
with the other c library testsuites.

Signed-off-by: Chris Friedt <[email protected]>

Author: cfriedt

MAINTAINERS.yml

@@ -2556,7 +2556,6 @@ Utilities:
     - tests/unit/list/
     - tests/unit/intmath/
     - tests/unit/pot/
-    - tests/lib/time/
     - tests/lib/onoff/
     - tests/lib/sys_util/
     - tests/lib/sprintf/

tests/lib/time/CMakeLists.txt renamed to tests/lib/c_lib/time/CMakeLists.txt

@@ -0,0 +1 @@
+CONFIG_ZTEST=y