manifest: Track our own libcore for tzdb-related updates

Change-Id: I19224a54a302ae04e74e3540a2c99398a7535d47

default.xml

@@ -526,7 +526,7 @@
   <project path="kernel/configs" name="kernel/configs" groups="vts,pdk" remote="aosp" />
   <project path="kernel/prebuilts/4.19/arm64" name="kernel/prebuilts/4.19/arm64" groups="pdk" clone-depth="1" remote="aosp" />
   <project path="kernel/tests" name="kernel/tests" groups="vts,pdk" remote="aosp" />
-  <project path="libcore" name="platform/libcore" groups="pdk" remote="aosp" />
+  <project path="libcore" name="LineageOS/android_libcore" groups="pdk" />
   <project path="libnativehelper" name="platform/libnativehelper" groups="pdk" remote="aosp" />
   <project path="packages/apps/BasicSmsReceiver" name="LineageOS/android_packages_apps_BasicSmsReceiver" groups="pdk-cw-fs,pdk-fs" />
   <project path="packages/apps/Bluetooth" name="LineageOS/android_packages_apps_Bluetooth" groups="pdk-cw-fs,pdk-fs" />