linux-imx

gpu: imx: dpu: extdst: Add extdst_pixengcfg_syncmode_master() helper

This patch adds extdst_pixengcfg_syncmode_master() helper support
so that the callers may control if a extdst is master or slave
when it works in sync mode.  The bit16 of extdst's PIXENGCFG_STATIC
register controls this and it's a part of sync mode fixup logic.

Signed-off-by: Liu Ying <victor.liu@nxp.com>