[OpenMP] Use new offloading binary when embedding offloading images

[OpenMP] Use new offloading binary when embedding offloading images

The previous patch introduced the offloading binary format so we can
store some metada along with the binary image. This patch introduces
using this inside the linker wrapper and Clang instead of the previous
method that embedded the metadata in the section name.

Differential Revision: https://reviews.llvm.org/D122683