Instead of assigning SSP1_DETECT inside mmc0_4bit_pins_a, let the board dts
handle this setup.

Not every board will use MX23_PAD_SSP1_DETECT as SSP1 functionality.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>