ver_linux: Use /usr/bin/awk instead of /bin/awk

ver_linux: Use /usr/bin/awk instead of /bin/awk

To avoid kernel-devsrc failing with missing a dependency on "/bin/awk".
Due to the way this script is invoked, using #!/usr/bin/env can run into
issue when invoked.

Since most distros have awk in /usr/bin and not /bin, we change the
script while this is sorted out upstream.

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>