drm/xe/xe2: Update render/compute context image sizes

The render and compute context are significantly smaller on Xe2 than on
previous platforms.

Registers:
 - Render:  3008 dwords -> 12032 bytes -> round to 3 pages
 - Compute: 1424 dwords ->  5696 bytes -> round to 2 pages

We also allocate one additional page for the HWSP, so the total
allocation sizes for render and compute are 4 and 3 pages respectively.

Bspec: 65182, 56578, 55793
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_lrc.c

@@ -37,9 +37,16 @@ size_t xe_lrc_size(struct xe_device *xe, enum xe_engine_class class)
 {
 	switch (class) {
 	case XE_ENGINE_CLASS_RENDER:
+		if (GRAPHICS_VER(xe) >= 20)
+			return 4 * SZ_4K;
+		else
+			return 14 * SZ_4K;
 	case XE_ENGINE_CLASS_COMPUTE:
 		/* 14 pages since graphics_ver == 11 */
-		return 14 * SZ_4K;
+		if (GRAPHICS_VER(xe) >= 20)
+			return 3 * SZ_4K;
+		else
+			return 14 * SZ_4K;
 	default:
 		WARN(1, "Unknown engine class: %d", class);
 		fallthrough;