OMAP3: igep0032: Fix regression due commit f3b4bc45.

Commit referenced in subject breaks IGEP0032 build with the following
error:

  drivers/misc/status_led.c:30:7: error: 'RED_LED_GPIO' undeclared here (not in a function)
  scripts/Makefile.build:275: recipe for target 'drivers/misc/status_led.o' failed
  make[2]: *** [drivers/misc/status_led.o] Error 1
  scripts/Makefile.build:420: recipe for target 'drivers/misc' failed
  make[1]: *** [drivers/misc] Error 2
  Makefile:1093: recipe for target 'drivers' failed
  make: *** [drivers] Error 2

Fix this by skipping the status led on IGEP0032 machine as is not available
and throw an error for future machines if the status led is not configured
to avoid build breakage.
Reported-by: NAlbert ARIBAUD <albert.u.boot@aribaud.net>
Signed-off-by: NEnric Balletbo i Serra <enric.balletbo@collabora.com>

include/configs/omap3_igep00x0.h

@@ -29,21 +29,24 @@
 
 #define CONFIG_REVISION_TAG		1
 
-/* Status LED */
+/* Status LED available for IGEP0020 and IGEP0030 but not IGEP0032 */
+#if (CONFIG_MACH_TYPE != MACH_TYPE_IGEP0032)
 #define CONFIG_STATUS_LED
 #define CONFIG_BOARD_SPECIFIC_LED
 #define CONFIG_GPIO_LED
 #if (CONFIG_MACH_TYPE == MACH_TYPE_IGEP0020)
 #define RED_LED_GPIO 27
-#endif
-#if (CONFIG_MACH_TYPE == MACH_TYPE_IGEP0030)
+#elif (CONFIG_MACH_TYPE == MACH_TYPE_IGEP0030)
 #define RED_LED_GPIO 16
+#else
+#error "status LED not defined for this machine."
 #endif
 #define RED_LED_DEV				0
 #define STATUS_LED_BIT			RED_LED_GPIO
 #define STATUS_LED_STATE		STATUS_LED_ON
 #define STATUS_LED_PERIOD		(CONFIG_SYS_HZ / 2)
 #define STATUS_LED_BOOT			RED_LED_DEV
+#endif
 
 /* GPIO banks */
 #define CONFIG_OMAP3_GPIO_3		/* GPIO64 .. 95 is in GPIO bank 3 */