omap: iovmm: remove cache flush operation

Cache flush operation is handled in the upper client layer and iovmm
modules doesn't have to care about it. This patch will improve some
performance with current camera isp driver.
Signed-off-by: NHiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/plat-omap/iovmm.c

@@ -392,7 +392,6 @@ static void sgtable_fill_vmalloc(struct sg_table *sgt, void *_va)
 	}
 
 	va_end = _va + PAGE_SIZE * i;
-	flush_cache_vmap((unsigned long)_va, (unsigned long)va_end);
 }
 
 static inline void sgtable_drain_vmalloc(struct sg_table *sgt)
@@ -427,8 +426,6 @@ static void sgtable_fill_kmalloc(struct sg_table *sgt, u32 pa, size_t len)
 		len -= bytes;
 	}
 	BUG_ON(len);
-
-	clean_dcache_area(va, len);
 }
 
 static inline void sgtable_drain_kmalloc(struct sg_table *sgt)