enum conversion warnings

[Nick Desaulniers]

pulling down tot, I'm seeing:

  CC [M]  drivers/gpu/drm/i915/intel_ddi.o
drivers/gpu/drm/i915/intel_ddi.c:1481:30: error: implicit conversion
from enumeration type 'enum port' to different enumeration type 'enum
intel_dpll_id' [-Werror,-Wenum-conversion]
        enum intel_dpll_id pll_id = port;
                           ~~~~~~   ^~~~

seems to be coming from commit 2952cd6fb4cc9 "drm/i915: Let's use more
enum intel_dpll_id pll_id."

That commit seems to be using enums instead of uints.  I think maybe
the final 2 hunks of that patch should be reverted?