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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/common/common.c

···
 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

···
 	return fsm->state_changed;
 }
 EXPORT_SYMBOL_GPL(otg_statemachine);
+MODULE_DESCRIPTION("OTG Finite State Machine");
 MODULE_LICENSE("GPL");