MLK-17491-8 pinctrl: imx: remove gpio_request_enable and gpio_disable_free

MLK-17491-8 pinctrl: imx: remove gpio_request_enable and gpio_disable_free

gpio_request_enable/disable_free actually are not quite necessary as
standard IMX pinctrl binding already sets GPIO mux from device tree,
e.g. VF610_PAD_PTB20__GPIO_42 or MX7D_PAD_SD2_CD_B__GPIO5_IO9
No need to do it again in gpio_request_enable.

Fixes: 5d7a13220ade ("MLK-15128-3 pinctrl: freescale: support scu and memmap pinctrl together")
Fixes: 07787c40ff3b ("MLK-13485-3 pinctrl: imx: modify the imx pinctrl to support imx7ulp gpio")
Cc: Fugang Duan <fugang.duan@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>