fpga: tools: Option to check for full Vivado version

This commits enables the FPGA build infrastructure to require a very
specific Vivado version, all the way to the patch level.

Vivado typically has the following version format:
  Year.release.update_patch

This commit enables setupenv_base.sh to optionally look for the
environment variable VIVADO_VER_FULL, which should contain the
full Vivado version in the format specified above.
Vivado is directly used to retrieve the installed version, returning
an error if the requested version is not found.

Example in setupenv.sh (which calls setupenv_base.sh):

  VIVADO_VER=2019.1
  VIVADO_VER_FULL=2019.1.1_AR73068

The setupenv.sh script will setup Vivado 2019.1, but it will also
verify that both Update 1 and patch AR73068 are installed.

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