bluez-alsa: fix select of libbsd
bluez-alsa/Config.in must select BR2_PACKAGE_LIBBSD, not the
non-existing BR2_PACKAGE_BSD.
Fixes:
http://autobuild.buildroot.net/results/ab6751615ac058d892258be9e7a8e110e68c62c5/
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>