Add system stubs as "provided" from vendor default

Add system stubs as "provided" from vendor default

For VNDK-lite devices, the default namespace of the vendor section works
like the default namespace of the system section.

So, provides/requires should be same as the system.default NS.

Bug: 153412158
Test: rundiff.sh
      check if vendor.com_android_os_statsd namespace has access to
      libbinder_ndk.so from vendor.default namespace
Merged-In: I1d68e12b34e360eb34edeb5155982b545c89c2f4
Change-Id: I1d68e12b34e360eb34edeb5155982b545c89c2f4
(cherry picked from commit 50371b2bf332a26b4f42191e0869a558db9d3222)