drm/i915/display: Add definition for MCURSOR_MODE_64_2B

MCURSOR_MODE_64_2B is used in Wa_16021440873. Add define for it.

Bspec: 69837
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240319123327.1661097-5-jouni.hogander@intel.com

drivers/gpu/drm/i915/i915_reg.h

@@ -3051,6 +3051,7 @@
 #define   MCURSOR_MODE_DISABLE		0x00
 #define   MCURSOR_MODE_128_32B_AX	0x02
 #define   MCURSOR_MODE_256_32B_AX	0x03
+#define   MCURSOR_MODE_64_2B		0x04
 #define   MCURSOR_MODE_64_32B_AX	0x07
 #define   MCURSOR_MODE_128_ARGB_AX	(0x20 | MCURSOR_MODE_128_32B_AX)
 #define   MCURSOR_MODE_256_ARGB_AX	(0x20 | MCURSOR_MODE_256_32B_AX)