[HIP][DRIVER][OFFLOAD] Do not unbundle unsupported file types

The offload bundler action should not unbundle the input file types that does not match the action type. This fixes an issue where .so files are unbundled when the action type is object files.

Reviewers: yaxunl

Differential Revision: https://reviews.llvm.org/D56321

llvm-svn: 350426