testing: nvdimm: iomap: make __nfit_test_ioremap a macro

The ioremap passed as argument to __nfit_test_ioremap can be a macro so
it cannot be passed as function argument. Make __nfit_test_ioremap into
a macro so that ioremap can be passed as untyped macro argument.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Fixes: 6bc75619 ("tools/testing/nvdimm: libnvdimm unit test infrastructure")
Link: https://lore.kernel.org/r/20220429134039.18252-1-msuchanek@suse.de


Signed-off-by: Dan Williams <dan.j.williams@intel.com>