OMAP3 flash: fix use of system_rev in board-3430sdp-flash.c

Fix one remaining user of system_rev.  This patch is needed for
3430SDP ES2 to boot after 4a4ada55.

Bisected by Timo-Pekka Launonen's <ext-timo-pekka.launonen@nokia.com>
list robot.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Timo-Pekka Launonen <ext-timo-pekka.launonen@nokia.com>
Cc: Lauri Leukkunen <lauri.leukkunen@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-3430sdp-flash.c

@@ -210,7 +210,7 @@ void __init sdp3430_flash_init(void)
 	gpmc_base_add   = OMAP34XX_GPMC_VIRT;
 
 	/* Configure start address and size of NOR device */
-	if (system_rev > OMAP3430_REV_ES1_0) {
+	if (omap_rev() > OMAP3430_REV_ES1_0) {
 		sdp_nor_resource.start	= FLASH_BASE_SDPV2;
 		sdp_nor_resource.end	= FLASH_BASE_SDPV2
 						+ FLASH_SIZE_SDPV2 - 1;