cimx/sb800 boards: Don't require ide.asl on boards without IDE

Not all boards which use the AMD cimx/sb800 southbridge have IDE.
However, the southbridge's asl included an 'ide.asl' file which had to
be present in $(mainboard_dir)/acpi.

Address this issue by including ide.asl only in boards which have IDE,
and remove it from all other cimx/sb800 boards.

Change-Id: I57fcb4db9f85234b05ae1705ef81a576c478cee6
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5460
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/southbridge/amd/cimx/sb800/acpi/fch.asl

@@ -77,12 +77,6 @@ Device(SBUS) {
 	Name(_ADR, 0x00140000)
 } /* end SBUS */
 
-/* Primary (and only) IDE channel */
-Device(IDEC) {
-	Name(_ADR, 0x00140001)
-	#include "acpi/ide.asl"
-} /* end IDEC */
-
 #include "audio.asl"
 
 #include "lpc.asl"