intel: Rename genx keyword to gfxx in source files

Commands used to do the changes:
export SEARCH_PATH="src/intel src/gallium/drivers/iris src/mesa/drivers/dri/i965"
grep -E "gen[[:digit:]]+" -rIl $SEARCH_PATH | xargs sed -ie "s/gen\([[:digit:]]\+\)/gfx\1/g"

Exclude pack.h and xml changes in this patch:
grep -E "gfx[[:digit:]]+_pack\.h" -rIl $SEARCH_PATH | xargs sed -ie "s/gfx\([[:digit:]]\+_pack\.h\)/gen\1/g"
grep -E "gfx[[:digit:]]+\.xml" -rIl $SEARCH_PATH | xargs sed -ie "s/gfx\([[:digit:]]\+\.xml\)/gen\1/g"

Signed-off-by: Anuj Phogat <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9936>

Author: aphogat

src/gallium/drivers/iris/iris_blit.c

@@ -579,7 +579,7 @@ get_copy_region_aux_settings(struct iris_context *ice,
        * for adjusting the clear color, so clear support may only be enabled
        * in some cases:
        *
-       * - On gen11+, the clear color is indirect and comes in two forms: a
+       * - On gfx11+, the clear color is indirect and comes in two forms: a
        *   32bpc representation used for rendering and a pixel representation
        *   used for sampling. blorp_copy doesn't change indirect clear colors,
        *   so clears are only supported in the sampling case.

src/gallium/drivers/iris/iris_bufmgr.c

@@ -1860,7 +1860,7 @@ iris_bufmgr_create(struct gen_device_info *devinfo, int fd, bool bo_reuse)
    util_vma_heap_init(&bufmgr->vma_allocator[IRIS_MEMZONE_SURFACE],
                       IRIS_MEMZONE_SURFACE_START,
                       _4GB_minus_1 - IRIS_MAX_BINDERS * IRIS_BINDER_SIZE);
-   /* TODO: Why does limiting to 2GB help some state items on gen12?
+   /* TODO: Why does limiting to 2GB help some state items on gfx12?
     *  - CC Viewport Pointer
     *  - Blend State Pointer
     *  - Color Calc State Pointer