drm/i915/bios: Update new entries in VBT BDB block definitions

drm/i915/bios: Update new entries in VBT BDB block definitions

New entries updated in BDB definition from VBT v257 to v260.

Extend fields in backlight power controller VBT block 43 for VBT v257.
Add t6 delay support fields in edp panel power block 27 for VBT v260.
Update supported VBT version range for obsolete fields.

v2:
- Update the commit message with description(Jani)
- Rename variable names align to spec names(Jani)

v3: Rename variables align to specs name (Suraj)

Signed-off-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240821121740.1596048-1-dnyaneshwar.bhadane@intel.com