* [VTA] Fix Pynq driver build issue.
Issue:
When doing vta compile in xilinx FPGA, the pynqdriver.cc report can
not find <vta/driver.h>

Solution:
add related path.

* Fix libvta load fail issue.

issue:
run vta on pynq board libvta.so load failed.

solution:
fixed VTA.make logic issue