ARM: OMAP: Fix gpio.c compile on 15xx with CONFIG_DEBUGFS

There are no wakeup registers on 15xx, and suspend_wakeup
does not exist in the struct gpio_bank.

Without this fix we'll get "arch/arm/plat-omap/gpio.c:1792:
error: 'struct gpio_bank' has no member named 'suspend_wakeup'"
as noted by Russell King.

Note that the ifdefs will be cleaned up once the omap gpio
code gets split into omap1 and omap2 specific parts.
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/gpio.c

@@ -1789,6 +1789,8 @@ static int dbg_gpio_show(struct seq_file *s, void *unused)
 /* FIXME for at least omap2, show pullup/pulldown state */
 
 			irqstat = irq_desc[irq].status;
+#if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP24XX) ||	\
+		defined(CONFIG_ARCH_OMAP34XX)
 			if (is_in && ((bank->suspend_wakeup & mask)
 					|| irqstat & IRQ_TYPE_SENSE_MASK)) {
 				char	*trigger = NULL;
@@ -1818,6 +1820,7 @@ static int dbg_gpio_show(struct seq_file *s, void *unused)
 						(bank->suspend_wakeup & mask)
 							? " wakeup" : "");
 			}
+#endif
 			seq_printf(s, "\n");
 		}