ARM: msm: Simplify ARCH_MSM_DT config

This doesn't need to be a def_bool y. Instead we can have every
DT supported platform select ARCH_MSM_DT and we achieve the same
thing with less chance of conflicts.
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: NDavid Brown <davidb@codeaurora.org>
Signed-off-by: NOlof Johansson <olof@lixom.net>

arch/arm/mach-msm/Kconfig

@@ -44,6 +44,7 @@ endchoice
 
 config ARCH_MSM8X60
 	bool "MSM8X60"
+	select ARCH_MSM_DT
 	select ARM_GIC
 	select CPU_V7
 	select GPIO_MSM_V2
@@ -52,6 +53,7 @@ config ARCH_MSM8X60
 
 config ARCH_MSM8960
 	bool "MSM8960"
+	select ARCH_MSM_DT
 	select ARM_GIC
 	select CPU_V7
 	select HAVE_SMP
@@ -60,6 +62,7 @@ config ARCH_MSM8960
 
 config ARCH_MSM8974
 	bool "MSM8974"
+	select ARCH_MSM_DT
 	select ARM_GIC
 	select CPU_V7
 	select HAVE_ARM_ARCH_TIMER
@@ -68,8 +71,7 @@ config ARCH_MSM8974
 	select USE_OF
 
 config ARCH_MSM_DT
-	def_bool y
-	depends on (ARCH_MSM8X60 || ARCH_MSM8960 || ARCH_MSM8974)
+	bool
 	select SPARSE_IRQ
 	select USE_OF