tests: set userspace tag for all tests that use it

This lets us quickly filter tests that exercise userspace
when developing it.

Some tests had a whitelist with qemu_cortex_m3; change
this to mps2_an385, which is the QEMU target with an
MPU enabled.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
12 files changed