drm/i915/bios: convert to struct intel_display

Going forward, struct intel_display shall replace struct
drm_i915_private as the main display device data pointer type. Convert
intel_bios.[ch] to struct intel_display.

Do one drive-by conversion of unnecessary hex usage to decimal.

Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/0d0261a53aff5f141b16b482222a5ffce78e176e.1723213547.git.jani.nikula@intel.com


Signed-off-by: Jani Nikula <jani.nikula@intel.com>