firmware: arm_ffa: Add missing rwlock_init() in ffa_setup_partitions()

Add the missing rwlock initialization for the individual FF-A partition
information in ffa_setup_partitions().

Fixes: 0184450b ("firmware: arm_ffa: Add schedule receiver callback mechanism")
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20240108-ffa_fixes_6-8-v1-1-75bf7035bc50@arm.comSigned-off-by: Sudeep Holla <sudeep.holla@arm.com>

drivers/firmware/arm_ffa/driver.c

@@ -1226,6 +1226,7 @@ static void ffa_setup_partitions(void)
 			ffa_device_unregister(ffa_dev);
 			continue;
 		}
+		rwlock_init(&info->rw_lock);
 		xa_store(&drv_info->partition_info, tpbuf->id, info, GFP_KERNEL);
 	}
 	drv_info->partition_count = count;