gpu: imx: simplify sync polarity setting
Use a function to convert the sync pin to a bit mask for the DI_GENERAL register, and move this out of the interlace/non-interlace path to the common path. Tested-by:Philipp Zabel <p.zabel@pengutronix.de> Reviewed-by:
Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by:
Russell King <rmk+kernel@arm.linux.org.uk>
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