drm/i915/display: Eliminate IS_GEN9_{BC,LP}

Now that we've eliminated INTEL_GEN(), IS_GEN_RANGE(), etc. from the
display code, we should also kill off our use of the IS_GEN9_* macros
too.  We'll do the conversion manually this time instead of using
Coccinelle since the most logical substitution can depend heavily on the
code context, and sometimes we can keep the code simpler if we make
additional adjustments such as swapping the order of if/else arms.

v2:
 - Restore a lost negation in intel_pll_is_valid().

Cc: Ville Syrjälä <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Signed-off-by: Matt Roper <[email protected]>
Reviewed-by: Radhakrishna Sripada <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 70bfb30743d5da73058b0a2271e9c127a84fb494)
[Jani: cherry picked to topic branch to reduce conflicts]
Signed-off-by: Jani Nikula <[email protected]>

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