Correct texture element size calculations

hipChannelFormatDesc contains size of each channel in bits. There's 8 bits per byte, not 4, so we should divide by 8.

Change-Id: I38ae2d28ad54740823c98908ca2afecad0ba0183

rocclr/hip_conversions.hpp

@@ -898,6 +898,6 @@ HIP_RESOURCE_VIEW_DESC getResourceViewDesc(const hipResourceViewDesc& resViewDes
 
 inline
 size_t getElementSize(const hipChannelFormatDesc &desc) {
-  return (desc.x / 4) * getNumChannels(desc);
+  return (desc.x / 8) * getNumChannels(desc);
 }
 };