Add Android Runtime APEX directories to Bionic search paths.

- Insert /apex/com.android.runtime/lib(64) before /system/lib(64)
  in the default library search paths (`kDefaultLdPaths`,
  `kAsanDefaultLdPaths`).
- Insert apex/com.android.runtime/bin before /system/bin in the
  default shell search path (`_PATH_DEFPATH`).

Test: Device boot test with Android Runtime APEX.
Test: Device boot test without Android Runtime APEX.
Bug: 113373927
Change-Id: I9ae6bfe6939f63e7d76e7b3c9b21d8b698bd8fda