gpu: ion: Add platform driver for msm ion

Add platform driver for msm specific ion devices

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
diff --git a/drivers/gpu/ion/Kconfig b/drivers/gpu/ion/Kconfig
index 5b48b4e..f4affe4 100644
--- a/drivers/gpu/ion/Kconfig
+++ b/drivers/gpu/ion/Kconfig
@@ -10,3 +10,8 @@
 	help
 	  Choose this option if you wish to use ion on an nVidia Tegra.
 
+config ION_MSM
+	tristate "Ion for MSM"
+	depends on ARCH_MSM && ION
+	help
+	  Choose this option if you wish to use ion on an MSM target.