[PATCH 7/8] OMAP: DSS2: DISPC: improve dispc_mgr_enable_digit_out()

dispc_mgr_enable_digit_out() didn't handle HDMI case very well.

Improve the function to use FRAMEDONETV interrupt to see when HDMI has
been disabled.
[PATCH 8/8] OMAP: DSS2: HDMI: fix hdmi output enable

Enabling HDMI output often causes sync lost errors. The problem seems to
go away if we first enable the HDMI output, and only then enable the
DISPC output.

This will also fix the dispc's dispc_mgr_enable_digit_out(), as the code
waits for two VSYNCs after enabling the output. If the HDMI output is
disabled (as it was previously), there are no VSYNCs and
dispc_mgr_enable_digit_out() will print timeout errors.