src/ec: Sanitize headers and comment #endif pairings

Comment #endif /* FOO */ pairings.
Alphabetise headers and remove any #if CONFIG_ guards around them.

Background rational:
Remove guarding the inclusion of headers based on CONFIG_ options. This
*potentially* could hide issues such as functions being swapped from
under our feet, since different runtime behaviour could be declared with
the same function same name and type-signature. Hence, depending on the
header we happen to get may change runtime behaviour.

Change-Id: Ic61bdfb64d99f0e2998c6451ae6686915b7bb3d4
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/6059
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/ec/google/chromeec/ec_spi.c

@@ -19,6 +19,7 @@
 
 #include <console/console.h>
 #include <spi-generic.h>
+
 #include "ec.h"
 #include "ec_commands.h"