drm/i915/lnl: Add pkgc related register

Add the register that needs to read and written onto for
deep pkgc programming.
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240201085158.1000285-2-suraj.kandpal@intel.com

drivers/gpu/drm/i915/display/skl_watermark_regs.h

@@ -157,4 +157,8 @@
 #define MTL_LATENCY_SAGV		_MMIO(0x4578c)
 #define   MTL_LATENCY_QCLK_SAGV		REG_GENMASK(12, 0)
 
+#define LNL_PKG_C_LATENCY		_MMIO(0x46460)
+#define   LNL_ADDED_WAKE_TIME_MASK	REG_GENMASK(28, 16)
+#define   LNL_PKG_C_LATENCY_MASK	REG_GENMASK(12, 0)
+
 #endif /* __SKL_WATERMARK_REGS_H__ */