x86: Add Moorestown early detection

Moorestown MID devices need to be detected early in the boot process
to setup and do not call x86_default_early_setup as there is no EBDA
region to reserve.

[ Copied the minimal code from Jacobs latest MRST series ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jacob Pan <jacob.jun.pan@intel.com>

arch/x86/kernel/head32.c

@@ -45,6 +45,9 @@ void __init i386_start_kernel(void)
 
 	/* Call the subarch specific early setup function */
 	switch (boot_params.hdr.hardware_subarch) {
+	case X86_SUBARCH_MRST:
+		x86_mrst_early_setup();
+		break;
 	default:
 		i386_default_early_setup();
 		break;