Remove an obsolete TODO

BUG=aomedia:2629

Change-Id: I51aa02d35e958a7b2b9008f61f64bd4710e689d4
diff --git a/aom_dsp/aom_convolve.c b/aom_dsp/aom_convolve.c
index e7cc659..7879b88 100644
--- a/aom_dsp/aom_convolve.c
+++ b/aom_dsp/aom_convolve.c
@@ -74,7 +74,6 @@
 
 static const InterpKernel *get_filter_base(const int16_t *filter) {
   // NOTE: This assumes that the filter table is 256-byte aligned.
-  // TODO(agrange) Modify to make independent of table alignment.
   return (const InterpKernel *)(((intptr_t)filter) & ~((intptr_t)0xFF));
 }