soc/intel/tigerlake: Drop unreferenced devicetree settings

No mainboard uses these settings, nor does SoC code. Drop them.

Change-Id: I5f5da8dfcec7dd35981611830b555cab5d6af3e3
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48572
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/tigerlake/chip.h

@@ -263,10 +263,8 @@ struct soc_intel_tigerlake_config {
 	uint8_t SmbusEnable;
 
 	/* Gfx related */
-	uint8_t IgdDvmt50PreAlloc;
 	uint8_t SkipExtGfxScan;
 
-	uint32_t GraphicsConfigPtr;
 	uint8_t Device4Enable;
 
 	/* HeciEnabled decides the state of Heci1 at end of boot