pvr: include pvr_common.h instead of pvr_private.h

This is the header that's *actually* needed here, pvr_private.h just
pulls it in for us. Since this is a header-file, let's use as narrow
includes as we can to avoid including everything everywhere and terrible
build times.

Reviewed-by: Simon Perretta <simon.perretta@imgtec.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37554>

src/imagination/vulkan/pvr_csb_enum_helpers.h

@@ -28,7 +28,7 @@
 #include <vulkan/vulkan_core.h>
 
 #include "pvr_csb.h"
-#include "pvr_private.h"
+#include "pvr_common.h"
 #include "util/macros.h"
 
 static const char *