[netd] fix deprecation warning

Fixes:
//system/netd/server:netd_unit_test clang-tidy IptablesRestoreControllerTest.cpp
/android0/aosp/system/netd/server/IptablesRestoreControllerTest.cpp:58:15:
warning: Google Test APIs named with 'case' are deprecated; use
equivalent APIs named with 'suite' [google-upgrade-googletest-case]
  static void SetUpTestCase() {
              ^~~~~~~~~~~~~
              SetUpTestSuite

Test: mm
Change-Id: Idfbc436cf15a96879165266edc51a5d6f45bd1c6
diff --git a/server/IptablesRestoreControllerTest.cpp b/server/IptablesRestoreControllerTest.cpp
index c9028df..20f6183 100644
--- a/server/IptablesRestoreControllerTest.cpp
+++ b/server/IptablesRestoreControllerTest.cpp
@@ -55,9 +55,7 @@
   int mIptablesLock = -1;
   std::string mChainName;
 
-  static void SetUpTestCase() {
-      blockSigpipe();
-  }
+  static void SetUpTestSuite() { blockSigpipe(); }
 
   void SetUp() {
     ASSERT_EQ(0, createTestChain());