[PATCH] mailbox: rockchip: Fix build error of missing devm_ioremap_resource on UM

[Krzysztof Kozlowski]

The devres.o gets linked if HAS_IOMEM is present so on ARCH=um
allyesconfig (COMPILE_TEST) failed with:

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
---
 drivers/mailbox/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index 5305923752d2..acdffc3d686b 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -46,6 +46,7 @@ config OMAP_MBOX_KFIFO_SIZE
 config ROCKCHIP_MBOX
 	bool "Rockchip Soc Intergrated Mailbox Support"
 	depends on ARCH_ROCKCHIP || COMPILE_TEST
+	depends on HAS_IOMEM
 	help
 	  This driver provides support for inter-processor communication
 	  between CPU cores and MCU processor on Some Rockchip SOCs.
-- 
2.5.0