drm/i915: Enable intel_color_get_config()

In this patch, intel_color_get_config() is enabled and support
for read_luts() will be added platform by platform incrementally
in the follow-up patches.

v4: -Renamed intel_get_color_config to intel_color_get_config [Jani]
    -Added the user early on such that support for get_color_config()
     can be added platform by platform incrementally [Jani]
v5: -Incorrect place for calling intel_color_get_config() in
     haswell_get_pipe_config() [Ville]
v6: -Renamed intel_color_read_luts() to intel_color_get_config()
     [Jani and Ville]
Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1559123462-7343-3-git-send-email-swati2.sharma@intel.com

drivers/gpu/drm/i915/intel_display.c

@@ -8661,6 +8661,7 @@ static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
 		pipe_config->cgm_mode = I915_READ(CGM_PIPE_MODE(crtc->pipe));
 
 	i9xx_get_pipe_color_config(pipe_config);
+	intel_color_get_config(pipe_config);
 
 	if (INTEL_GEN(dev_priv) < 4)
 		pipe_config->double_wide = tmp & PIPECONF_DOUBLE_WIDE;
@@ -9758,6 +9759,7 @@ static bool ironlake_get_pipe_config(struct intel_crtc *crtc,
 	pipe_config->csc_mode = I915_READ(PIPE_CSC_MODE(crtc->pipe));
 
 	i9xx_get_pipe_color_config(pipe_config);
+	intel_color_get_config(pipe_config);
 
 	if (I915_READ(PCH_TRANSCONF(crtc->pipe)) & TRANS_ENABLE) {
 		struct intel_shared_dpll *pll;
@@ -10206,6 +10208,8 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
 		i9xx_get_pipe_color_config(pipe_config);
 	}
 
+	intel_color_get_config(pipe_config);
+
 	power_domain = POWER_DOMAIN_PIPE_PANEL_FITTER(crtc->pipe);
 	WARN_ON(power_domain_mask & BIT_ULL(power_domain));