dma: remove refactor artifact

9e6a072 added a enum that adds a name clashes when
WOLFHSM_CFG_DMA_CUSTOM_CLIENT_COPY is defined. As the enum looks unused,
it's probably just a artifact of a refactoring.

Author: rizlik

wolfhsm/wh_dma.h

@@ -45,13 +45,6 @@ typedef enum {
     WH_DMA_OPER_CLIENT_WRITE_POST = 3,
 } whDmaOper;
 
-#ifdef WOLFHSM_CFG_DMA_CUSTOM_CLIENT_COPY
-typedef enum {
-    WH_DMA_COPY_OPER_CLIENT_READ  = 0,
-    WH_DMA_COPY_OPER_CLIENT_WRITE = 1,
-} whDmaCopyOper;
-#endif /* WOLFHSM_CFG_DMA_CUSTOM_CLIENT_COPY */
-
 /* Flags embedded in request/response structs provided by client */
 typedef struct {
     uint8_t cacheForceInvalidate : 1;