pinctrl: imx8qxp: break the dependency on SOC_IMX8QXP

ARM64 SoC does not encourage people to add more finegrained SoC
config options rather than a single ARCH_<family> in arch Kconfig.
So this patch aims to break the dependency on SOC_IMX8QXP.

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/Kconfig

@@ -130,7 +130,7 @@ config PINCTRL_IMX8MQ
 
 config PINCTRL_IMX8QXP
 	bool "IMX8QXP pinctrl driver"
-	depends on SOC_IMX8QXP
+	depends on ARCH_MXC && ARM64
 	select PINCTRL_IMX_SCU
 	help
 	  Say Y here to enable the imx8qxp pinctrl driver