machine/include: drop tune-cortexm*.inc and tune-cortexr4.inc
The Cortex M1, M3 and R4 CPU tuning files are poorly tested (if at
all). They have no obvious users either inside or outside oe-core.
Until OE officially gains support for CPUs without an MMU, these
tuning files are probably better maintained outside of oe-core (e.g.
in a separate meta-nommu layer).
Signed-off-by: Andre McCurdy <armccurdy@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
