NetBpfLoad: suppress debug log if NETBPFLOAD_VERBOSE_LOG is not defined

Reduces ~900 lines of log spam by suppressing non-warning messages.
Verbose logging can be re-enabled for debugging by defining the
NETBPFLOAD_VERBOSE_LOG macro.

Bug: 428792764
Flag: EXEMPT logging only change
Test: TH
Change-Id: Ieac3e7ee843b889fb404a89cfe2319ec34ab365c

bpf/loader/NetBpfLoad.cpp

@@ -1835,6 +1835,9 @@ static bool isWear() {
 
 static int libbpfPrint(enum libbpf_print_level lvl, const char *const formatStr,
                        va_list argList) {
+#ifndef NETBPFLOAD_VERBOSE_LOG
+    if (lvl != LIBBPF_WARN) return 0;
+#endif
     int32_t prio;
     switch (lvl) {
       case LIBBPF_WARN: