x86/intel_mid: Kconfig select fix

If we select a symbol it should have a type declared first
otherwise in some situations the config tools get upset. They
are currently perhaps a bit too resilient which is why this
wasn't noticed initially.
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Link: http://lkml.kernel.org/r/20111206132811.4041.32549.stgit@bob.linux.org.ukSigned-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/Kconfig

@@ -401,6 +401,9 @@ config X86_WANT_INTEL_MID
 
 if X86_WANT_INTEL_MID
 
+config X86_INTEL_MID
+	bool
+
 config X86_MRST
        bool "Moorestown MID platform"
 	depends on PCI