i2c: loongson: fix irq not freed when remove module

LoongArch inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7362E



--------------------------------

The interrupt resource of i2c_loongson module is not free normally when
rmmod. We should free the interrupt resource in loongson_i2c_remove.

Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn>
Change-Id: I329560ece8890f5d462b898a814bdcecd5951b6b