rk3399: display: Use edid_set_framebuffer_bits_per_pixel() helper
This refactoring was already carried into RK3288 with commit
6911219
(edid: Add helper function to calculate bits-per-pixel dependent values)
but it seems that the code for RK3399 was copy&pasted from it too early
to pick this up. Fix that so that future Rockchip SoCs can copy&paste
the right thing.
Change-Id: I5050c58d18db38fffabc7666e67a622d4a828590
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/17050
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>