ARM: dts: imx53: fix SD2_DATA1 pad AUDMUX_AUD4 configuration

The IOMUXC_AUDMUX_P4_INPUT_TXCLK_AMX_SELECT_INPUT must be configured as 1
instead of 0 to have AUD4 muxed on SD2 pins working.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>