usb: common: add missing MODULE_DESCRIPTION() macros

With ARCH=x86, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/usb/common/usb-common.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/usb/common/usb-otg-fsm.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://lore.kernel.org/r/20240611-md-drivers-usb-common-v1-1-f81555b0bd0d@quicinc.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/common/common.c

@@ -433,4 +433,5 @@ static void __exit usb_common_exit(void)
 subsys_initcall(usb_common_init);
 module_exit(usb_common_exit);
 
+MODULE_DESCRIPTION("Common code for host and device side USB");
 MODULE_LICENSE("GPL");

drivers/usb/common/usb-otg-fsm.c

@@ -449,4 +449,5 @@ int otg_statemachine(struct otg_fsm *fsm)
 	return fsm->state_changed;
 }
 EXPORT_SYMBOL_GPL(otg_statemachine);
+MODULE_DESCRIPTION("OTG Finite State Machine");
 MODULE_LICENSE("GPL");