linux-wandboard

MLK-14012 pinctrl: imx: fix imx_pinctrl_parse_pin

list is a local variable, each time imx_pinctrl_parse_pin is
invoked, list points to the first pin. Directly use list_p in
imx_pinctrl_parse_pin to fix it.

When splitting pinctrl-imx.c, two pieces code is correctly moved.
 - In imx_pmx_set_one_pin, when mux_reg is -1, need to return 0 to
   let the caller continue the loop.
 - In imx_pinctrl_parse_pin, need to use (mux_reg != -1) when calculating
   the pin_id.

Signed-off-by: Peng Fan <peng.fan@nxp.com>