staging: vt6655: Rename pbyEtherAddr to mac_addr

Fix name of a variable in two macros that use CamelCase which is not
accepted by checkpatch.pl

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/fcc66446a04c1ecb3c2b66cdd47e932c231b1b9d.1656835310.git.philipp.g.hortmann@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>