drm/i915/icp: Introduce Ice Lake PCH

Add the enum additions to ICP PCH.

v2 (from Paulo): don't set any platforms to it yet since ICP support is
incomplete.
v3 (from Rodrigo): Fix ICP name.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180111180010.24357-4-paulo.r.zanoni@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -782,6 +782,7 @@ enum intel_pch {
 	PCH_SPT,        /* Sunrisepoint PCH */
 	PCH_KBP,        /* Kaby Lake PCH */
 	PCH_CNP,        /* Cannon Lake PCH */
+	PCH_ICP,	/* Ice Lake PCH */
 	PCH_NOP,
 };
 
@@ -2849,6 +2850,7 @@ intel_info(const struct drm_i915_private *dev_priv)
 #define INTEL_PCH_QEMU_DEVICE_ID_TYPE		0x2900 /* qemu q35 has 2918 */
 
 #define INTEL_PCH_TYPE(dev_priv) ((dev_priv)->pch_type)
+#define HAS_PCH_ICP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_ICP)
 #define HAS_PCH_CNP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CNP)
 #define HAS_PCH_CNP_LP(dev_priv) \
 	((dev_priv)->pch_id == INTEL_PCH_CNP_LP_DEVICE_ID_TYPE)