Add gServiceSidMap.

Like gServicePrioMap. b/122472540 is filed to merge these maps
in the future, but creating a separate map so that it can be easily
backported.

Bug: 121035042
Test: boot and check for SID values for calls into hwservicemanager
    coming from clients which called IServiceManager::getService.

Change-Id: I4e5821d91ea694f86911218c23e68fcb987daaf9
Merged-In: I4e5821d91ea694f86911218c23e68fcb987daaf9
(cherry picked from commit d7f8d2226f5c7e98d12137732846e4ba55048927)
diff --git a/transport/Static.cpp b/transport/Static.cpp
index cbe6add..a506644 100644
--- a/transport/Static.cpp
+++ b/transport/Static.cpp
@@ -35,7 +35,9 @@
 ConcurrentMap<const ::android::hidl::base::V1_0::IBase*, wp<::android::hardware::BHwBinder>>
     gBnMap{};
 
+// TODO(b/122472540): replace with single, hidden map
 ConcurrentMap<wp<::android::hidl::base::V1_0::IBase>, SchedPrio> gServicePrioMap{};
+ConcurrentMap<wp<::android::hidl::base::V1_0::IBase>, bool> gServiceSidMap{};
 
 // Deprecated; kept for ABI compatibility. Use getBsConstructorMap.
 BsConstructorMap gBsConstructorMap{};