change SRCREV of librba

change SRCREV of librba

- To hide unnecessary internal interfaces from user, reconstructed
  public files of librba.
- Removed installation of internal header files.

 Bug-AGL: SPEC-3738

Change-Id: If54a4601b65b04fedb93712906a12f78d75dd2e8
Signed-off-by: Anusha Gugale <external.agogale@jp.adit-jv.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/25934
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>