eal/bsd: fix core detection

eal/bsd: fix core detection

Following "options parsing" patchset (commit d7cb626f and 489a9d6c), core
detection is not working correctly on bsd.

./x86_64-native-bsdapp-gcc/app/test -c f -n 4 -- -i
[...]
EAL: lcore 0 unavailable
EAL: invalid coremask

Align bsd to linux:
- commit f563a372 "eal: fix recording of detected/enabled logical cores"
- commit 4f04db8b "eal: check coremask against detected lcores"

Reported-by: Zhan, Zhaochen <zhaochen.zhan@intel.com>
Signed-off-by: David Marchand <david.marchand@6wind.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Tested-by: Zhaochen Zhan <zhaochen.zhan@intel.com>