[GPU] Added janky(?) support for register: D1MODE_V_COUNTER

Put internal_display_resolution into graphics_system

Thanks Beeanyew for initial implementation

src/xenia/gpu/register_table.inc

@@ -479,6 +479,8 @@ XE_GPU_REGISTER(0x1927, kDword, DC_LUT_WRITE_EN_MASK)
 // Default: 0x00000000.
 XE_GPU_REGISTER(0x1930, kDword, DC_LUTA_CONTROL)
 
+XE_GPU_REGISTER(0x194C, kDword, D1MODE_V_COUNTER)
+
 XE_GPU_REGISTER(0x1961, kDword, AVIVO_D1MODE_VIEWPORT_SIZE)
 
 XE_GPU_REGISTER(0x1964, kDword, AVIVO_D1SCL_SCALER_ENABLE)