freedreno: context priority support

For devices (and kernels) which support different priority ringbuffers,
expose context priority support.

Signed-off-by: Rob Clark <robdclark@gmail.com>
diff --git a/configure.ac b/configure.ac
index 138459c..79f275d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -78,7 +78,7 @@
 LIBDRM_INTEL_REQUIRED=2.4.75
 LIBDRM_NVVIEUX_REQUIRED=2.4.66
 LIBDRM_NOUVEAU_REQUIRED=2.4.66
-LIBDRM_FREEDRENO_REQUIRED=2.4.74
+LIBDRM_FREEDRENO_REQUIRED=2.4.89
 LIBDRM_ETNAVIV_REQUIRED=2.4.82
 
 dnl Versions for external dependencies