[mlir][GPUToSPIRV] Use default ABI only when none of the arguments

have abi attributes.

To ensure there is no conflict, use the default ABI only when none of
the arguments have the spv.interface_var_abi attribute. This also
implies that if one of the arguments has a spv.interface_var_abi
attribute, all of them should have it as well.

Differential Revision: https://reviews.llvm.org/D77232