eal/bsd: fix build
eal/bsd: fix build

When compiling on FreeBSD, a warning/error is thrown for
unused parameter. This patch aim to fix the issue by delete
the useless func definition.

Fixes: 89ecd110524d ("eal: modify device event process function")

Signed-off-by: Jeff Guo <62aa901f8680899d1e8b3d9b45cf4843c2976e1c@intel.com>
Reviewed-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk