[POWERPC] 86xx: mark functions static, other minor cleanups

Cleanups as suggested by Stephen Rothwell and Dale Farnsworth, which
incudes marking a bunch of functions static and add a vendor prefix to
the compat node check for uniqueness.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/boot/dts/mpc8641_hpcn.dts b/arch/powerpc/boot/dts/mpc8641_hpcn.dts
index 79385bc..7f9b999 100644
--- a/arch/powerpc/boot/dts/mpc8641_hpcn.dts
+++ b/arch/powerpc/boot/dts/mpc8641_hpcn.dts
@@ -13,7 +13,7 @@
 
 / {
 	model = "MPC8641HPCN";
-	compatible = "mpc86xx";
+	compatible = "fsl,mpc8641hpcn";
 	#address-cells = <1>;
 	#size-cells = <1>;