arm64: defconfig: add imx8qm pinctrl support

Except MX8QM pinctrl driver is missing, all other necessary drivers
for a booting are reused from MX8QXP which are already enabled
in defconfig.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>