When the HDMI controller device node was added, the needed PLL clock
macros were not exported. A separate patch addresses that, but it is
merged through a different tree.

Now that both patches are in mainline proper, we can convert the raw
numbers to proper macros.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>