arm64: dts: imx93: add the Flex-CAN stop mode by GPR

imx93 A0 chip use the internal q-channel handshake signal in LPCG
and CCM to automatically handle the Flex-CAN stop mode. But this
method meet issue when do the system PM stress test. IC can't fix
it easily. So in the new imx93 A1 chip, IC drop this method, and
involve back the old way，use the GPR method to trigger the Flex-CAN
stop mode signal. Now NXP claim to drop imx93 A0, and only support
imx93 A1. So here add the stop mode through GPR.

This patch also fix a typo for aonmix_ns_gpr.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Link: https://lore.kernel.org/all/20230726112458.3524165-1-haibo.chen@nxp.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

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