refine code for the usage of set_image_base_index

refine code for the usage of set_image_base_index

In libgbe.so and libgbeinterp.so, the same function pointer name
gbe_set_image_base_index is used for a unified source code.

In libcl.so, function pointer names begin with compiler_* point to
the functions from libgbe.so, function pointer names begin with
gbe_* point to the functions from libgbeinterp.so.

Signed-off-by: Guo Yejun <yejun.guo@intel.com>
Reviewed-by: Zhigang Gong <zhigang.gong@linux.intel.com>