i2c: imx-lpi2c: clean rx/tx buffers upon new message

stable inclusion
from stable-v5.10.178
commit e1f80b4dfad966638f5c65ae9f98d599c4be8cf2
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8D927

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e1f80b4dfad966638f5c65ae9f98d599c4be8cf2



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[ Upstream commit 987dd36c ]

When start sending a new message clear the Rx & Tx buffer pointers in
order to avoid using stale pointers.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Tested-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>