mainboard/intel/mohonpeak: code cleanup

Code cleanup requested in commit 90957f88 -
"mainboard/intel: Add Mohon Peak CRB for Intel's atom c2000"

- Change com2 to COM2 in Kconfig text
- clean up includes of headers
- fix whitespace

Change-Id: I828bc4781ee7de95be5546206c5d6033b75293d9
Signed-off-by: Martin Roth <martin.roth@se-eng.com>
Reviewed-on: http://review.coreboot.org/6607
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/mainboard/intel/mohonpeak/Kconfig

@@ -94,6 +94,6 @@ config UART_FOR_CONSOLE
 	int
 	default 1
 	help
-	  The Mohon Peak board uses com2 (2f8) for the serial console.
+	  The Mohon Peak board uses COM2 (2f8) for the serial console.
 
 endif # BOARD_INTEL_MOHONPEAK