pvr, pco: Add new compiler framework and shader gen stubs

Signed-off-by: Simon Perretta <simon.perretta@imgtec.com>
Acked-by: Frank Binns <frank.binns@imgtec.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32258>

src/imagination/vulkan/pvr_cmd_buffer.c

@@ -48,7 +48,7 @@
 #include "pvr_private.h"
 #include "pvr_tex_state.h"
 #include "pvr_types.h"
-#include "pvr_uscgen.h"
+#include "usc/pvr_uscgen.h"
 #include "pvr_winsys.h"
 #include "util/bitscan.h"
 #include "util/bitset.h"