dm: video: Sync display on backspace
We should sync the display (e.g. flush cache) when backspace is pressed to ensure that the character is erased correctly. Signed-off-by: NSimon Glass <sjg@chromium.org> Acked-by: NAnatolij Gustschin <agust@denx.de> Tested-by: NMarcel Ziswiler <marcel.ziswiler@toradex.com> Tested-on: Beaver, Jetson-TK1
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