[OpenMP] Add Cuda path to linker wrapper tool

The linker wrapper tool uses the 'nvlink' and 'ptxas' binaries to link
and assemble device files. Previously we searched for this using the
binaries in the user's path. This didn't work in cases where the user
passed in a specific Cuda path to Clang. This patch changes the linker
wrapper to accept an argument for the Cuda path we can get from Clang.
This should fix #53573.

Reviewed By: tianshilei1992

Differential Revision: https://reviews.llvm.org/D118944