samples: hash_map: Add newlib filter to samples.yaml

Not all toolchains support newlib so tests that require newlib need
to have a filter to we don't try and build those tests on those
testcases.  Add the following to samples.yaml to handle the issue:

	filter: TOOLCHAIN_HAS_NEWLIB == 1

Signed-off-by: Kumar Gala <kumar.gala@intel.com>