HAVE_LIBPCIACCESS that is currently passed through MAKE_VARS to disable
building with libpciaccess can't be set through the environment.
Instead, use CONFIG_CON_PCI, which can be passed through the environment
and will disable libpciaccess.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

This utility is intended to analyze EEPROM/boarddata content of Atheros
based boards: load, dump, parse and perform quick edit. Mostly it is
used to work with binary dumps/blobs on a host, but sometime it is
useful to be able to run it on a board, e.g. to make an EEPROM content
dump or to quickly analyze ART/boarddata without copying it to a host.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>