liblog: remove mistakenly added symbols from vndk

These functions and headers were all mistakenly added to the vndk.
They should not be used by vendors.

Test: these symbols do not appear in vendor libraries
Merged-In: I03919b437c2d9f0e573b7a6b40249ed12fe874b9
Change-Id: I03919b437c2d9f0e573b7a6b40249ed12fe874b9
9 files changed