remoteproc/mediatek: acknowledge watchdog IRQ after handled

stable inclusion
from stable-5.10.20
commit 291803ee73196aceffd2005505f81cf81c16ee38
bugzilla: 50608

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

[ Upstream commit 8c545f52 ]

Acknowledges watchdog IRQ after handled or kernel keeps receiving the
interrupt.

Fixes: fd0b6c1f ("remoteproc/mediatek: Add support for mt8192 SCP")
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20210127082046.3735157-1-tzungbi@google.com


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>