video: mxsfb: enable setting HSYNC negative polarity

HSYNC signal can now be flipped according to display_flags bitmaks by
writing its bitmask on vdctrl0 register.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Reviewed-by: Anatolij Gustschin <agust@denx.de>
1 file changed