s/INTERP_FILTER/InterpFilter/

this matches style guidelines and stabilizes successive runs of
clang-format across the tree. remaining types should be address in
successive commits.

Change-Id: I6ad3f69cf0a22cb9a9b895b272195f891f71170f
diff --git a/av1/common/filter.c b/av1/common/filter.c
index 3960ab4..544e3da 100644
--- a/av1/common/filter.c
+++ b/av1/common/filter.c
@@ -222,7 +222,7 @@
 #endif  // USE_TEMPORALFILTER_12TAP
 
 InterpFilterParams av1_get_interp_filter_params(
-    const INTERP_FILTER interp_filter) {
+    const InterpFilter interp_filter) {
 #if USE_TEMPORALFILTER_12TAP
   if (interp_filter == TEMPORALFILTER_12TAP)
     return av1_interp_temporalfilter_12tap;
@@ -230,7 +230,7 @@
   return av1_interp_filter_params_list[interp_filter];
 }
 
-const int16_t *av1_get_interp_filter_kernel(const INTERP_FILTER interp_filter) {
+const int16_t *av1_get_interp_filter_kernel(const InterpFilter interp_filter) {
 #if USE_TEMPORALFILTER_12TAP
   if (interp_filter == TEMPORALFILTER_12TAP)
     return av1_interp_temporalfilter_12tap.filter_ptr;