arch: switch to corei7
arch: switch to corei7

Edison is known to support corei7 instructions. Being a slm atom core it is
better optimized for 32bits. On Pyro setting tune to corei7-32 caused non-
functioning sdk build. On Sumo sdk work fine. Switch tune.

Signed-off-by: Ferry Toth <b7ff6f7d33f1b320413095ad62cad5fa92c49512@exalondelft.nl>

htot/meta-intel-edison,htot/meta-intel-edison,htot/meta-intel-edison,htot/meta-intel-edison,htot/meta-intel-edison