drivers: switch: Added SIO Switch support and Zeus Ear key driver.

Signed-off-by: David Rodero <david@codiguiel.net>
drivers: input: misc: Added Zeus power button driver.

Signed-off-by: David Rodero <david@codiguiel.net>
latona: added board code for Zeus power, ear keys and headset device.

Signed-off-by: David Rodero <david@codiguiel.net>