arm64: dt: imx93: tqma9352-mba93xxla: Fix LPUART2 pad config

stable inclusion
from stable-v6.6.7
commit 231ab2ff6039d250c7622e499cededd38fa62f92
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8SSQ4

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=231ab2ff6039d250c7622e499cededd38fa62f92



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[ Upstream commit 2bfba37b3d90d6d2d499d5b0dfe99c05c38b1b54 ]

LPUART2_RTS# has an external pull-down, so do not enable the internal
pull-up at the same time, use a pull-down instead.

Fixes: c982ecfa ("arm64: dts: freescale: add initial device tree for MBa93xxLA SBC board")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>