* [VTA] Add VTA PYNQ metal_test bitstream program logic and fix couple compile issue.

Issue:
VTAProgram not exist and cause compile error.
No logic to program the bitstream into FPGA.
metal test still use pynq 2.1 library which not support on latest
pynq 2.4.

Solution:
remove old VTAProgram.
when setting is pynq, program the bitstream during compile.
change DMA link library to libcma.

* Address review commends.