Remove redunancy in Kconfig

Remove redunancy in Kconfig

Socket Kconfig unconditionally selects CPU_INTEL_CORE.

Change-Id: I5eb7dd17047a2a031dd7345390d7f5f756055e18
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/307
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>