Make test cases independent from from each other. Eg. if a test case needs
a specific value in register A, don't rely on the fact that it is already
set by the preceding test case.
Signed-off-by: Michael Walle <michael@walle.cc>
Introduce new target "check_%" to run individual test caes, eg.
make check_mmu
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
