b43: Don't compile N-PHY code when N-PHY is disabled

There's no need to compile the N-PHY support code, when the
N-PHY support is disabled in Kconfig.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2 files changed