drm/i915: use REG_FIELD_PREP() to define register bitfield values

Slightly verbose, but does away with hand rolled shifts. Ties the field
values with the mask defining the field.

Unfortunately we have to make a local copy of FIELD_PREP() to evaluate
to a integer constant expression. But with this, we can ensure the mask
is non-zero, power of 2, fits u32, and the value fits the mask (when the
value is a constant expression).

Convert power sequencer registers as an example.

v4:
- rebase

v3:
- rename the macro to REG_FIELD_PREP to avoid underscore prefix and to
  be in line with kernel macros (Chris)
- rename power of 2 check macro (Chris)

v2:
 - add build-time checks with BUILD_BUG_ON_ZERO()
 - rename to just _FIELD() due to regmap.h REG_FIELD() clash

Cc: Chris Wilson <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Michal Wajdeczko <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Acked-by: Rodrigo Vivi <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/a844edda2afa6b54d9b12a6251da02c43ea8a942.1552657998.git.jani.nikula@intel.com

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