powerpc: add support for reserved memory defined by device tree

Enable reserved memory initialization from device tree.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 957bf34..3b6617f 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -90,6 +90,7 @@
 	select BINFMT_ELF
 	select OF
 	select OF_EARLY_FLATTREE
+	select OF_RESERVED_MEM
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_DYNAMIC_FTRACE
 	select HAVE_FUNCTION_TRACER