[PATCH] power: reset: reboot mode: fix build error of missing ioremap/iounmap on UM

[Andy Yan <andy.yan@rock-chips.com>]

Add missing HAS_IOMEM dependency for MFD_SYSCON to fix the um-allyesconfig
build error:

drivers/mfd/syscon.c: In function 'of_syscon_register':
drivers/mfd/syscon.c:67:9: error: implicit declaration of function 'ioremap' [-Werror=implicit-function-declaration]
  base = ioremap(res.start, resource_size(&res));
         ^
drivers/mfd/syscon.c:67:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
  base = ioremap(res.start, resource_size(&res));
       ^
drivers/mfd/syscon.c:109:2: error: implicit declaration of function 'iounmap' [-Werror=implicit-function-declaration]
  iounmap(base);
  ^

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
---

 drivers/power/reset/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 7053abc..1388be3 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -190,6 +190,7 @@ config REBOOT_MODE
 config SYSCON_REBOOT_MODE
 	tristate "Generic SYSCON regmap reboot mode driver"
 	depends on OF
+	depends on HAS_IOMEM
 	select REBOOT_MODE
 	select MFD_SYSCON
 	help
-- 
2.7.4