mach-shmobile: Use DT_MACHINE for KZM9D V3

Use DT_MACHINE_START() on the emev2 based KZM9D board.

Also include a tiny DTS file to describe the board and
update the Kconfig dependencies to select CONFIG_USE_OF.

Update the SMP glue code to use OF for matching.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index 8d3c2b1..7dcf08e 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -107,6 +107,7 @@
 config MACH_KZM9D
 	bool "KZM9D board"
 	depends on ARCH_EMEV2
+	select USE_OF
 
 comment "SH-Mobile System Configuration"