firewire: add missing MODULE_DESCRIPTION() to test modules

Fix the 'make W=1' warnings:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/firewire/uapi-test.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/firewire/packet-serdes-test.o
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://lore.kernel.org/r/20240523-md-firewire-uapi-test-v1-1-6be5adcc3aed@quicinc.comSigned-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

drivers/firewire/packet-serdes-test.c

@@ -579,4 +579,5 @@ static struct kunit_suite packet_serdes_test_suite = {
 };
 kunit_test_suite(packet_serdes_test_suite);
 
+MODULE_DESCRIPTION("FireWire packet serialization/deserialization unit test suite");
 MODULE_LICENSE("GPL");

drivers/firewire/uapi-test.c

@@ -86,4 +86,5 @@ static struct kunit_suite structure_layout_test_suite = {
 };
 kunit_test_suite(structure_layout_test_suite);
 
+MODULE_DESCRIPTION("FireWire UAPI unit test suite");
 MODULE_LICENSE("GPL");