test: Drop the _test suffix on linker lists

Most test suites have a _test suffix. This is not necessary as there is
also a ut_ prefix.

Drop the suffix so that (with future work) the suite name can be used as
the linker-list name.

Remove the suffix from the pytest regex as well, moving it to the top of
the file, as it is a constant.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/cmd/mem_search.c b/test/cmd/mem_search.c
index 3a031ee..df8938b 100644
--- a/test/cmd/mem_search.c
+++ b/test/cmd/mem_search.c
@@ -14,7 +14,7 @@
 #define BUF_SIZE	0x100
 
 /* Declare a new mem test */
-#define MEM_TEST(_name, _flags)	UNIT_TEST(_name, _flags, mem_test)
+#define MEM_TEST(_name, _flags)	UNIT_TEST(_name, _flags, mem)
 
 /* Test 'ms' command with bytes */
 static int mem_test_ms_b(struct unit_test_state *uts)