drm/i915/xe3p_lpd: Remove gamma,csc bottom color checks

With Xe3p_LPD, the SKL_BOTTOM_COLOR_GAMMA_ENABLE and
SKL_BOTTOM_COLOR_CSC_ENABLE bits are being removed. Thus, we need not
set gamma_enable nor csc_enable in crtc_state.

Note that GAMMA_MODE.POST_CSC_GAMMA_ENABLE and CSC_MODE.ICL_CSC_ENABLE
are the documented alternatives for the bottom color bits being removed.
But as these suggested bits are being checked in state checker as part
of gamma_mode, csc_mode fields and as gamma_enable/csc_enable are not
being used anywhere else functionally post ICL, we need not set these
fields in crtc_state.

Bspec: 69734
Signed-off-by: Sai Teja Pottumuttu <sai.teja.pottumuttu@intel.com>
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Link: https://patch.msgid.link/20251103-xe3p_lpd-basic-enabling-v3-7-00e87b510ae7@intel.com
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>

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