Restore common.h include in ops.cuh for DataType_t enum

common.h defines General8bit, FP4, NF4 enum values used in template
instantiations. It was previously the only include; now include both
common.h (for DataType_t) and common.cuh (for BNB_WARP_SIZE).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: TimDettmers

csrc/ops.cuh

@@ -14,6 +14,7 @@
 #include <vector>
 
 #include "compat.cuh"
+#include <common.h>
 #include "common.cuh"
 
 // ============================================================================