ARM: dts: move hdmi pinctrl out of board file.

This patch moves hdmi pinctrl defination from board file to soc level
pinctrl file. If not this pinctrl setup will be duplicated across all
the apq8064 based board files.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>