Delete unused import

The hasBpfSupport() check from BpfUtils is not used by the native helper
in framework. Remove them.

Bug: 111441138
Test: Build without failure.
Change-Id: Icdd01bf1a03efd7883e4939d0d730303ec1004e7

core/jni/com_android_internal_net_NetworkStatsFactory.cpp

@@ -35,7 +35,6 @@
 #include "bpf/BpfUtils.h"
 #include "netdbpf/BpfNetworkStats.h"
 
-using android::bpf::hasBpfSupport;
 using android::bpf::parseBpfNetworkStatsDetail;
 using android::bpf::stats_line;
 

services/core/jni/com_android_server_net_NetworkStatsService.cpp

@@ -34,7 +34,6 @@
 #include "netdbpf/BpfNetworkStats.h"
 
 using android::bpf::Stats;
-using android::bpf::hasBpfSupport;
 using android::bpf::bpfGetUidStats;
 using android::bpf::bpfGetIfaceStats;