msm: clock-local: Support enable dependencies for branch clocks

rcg clocks already support implicit enablement of a chain of
dependent clocks.  Add similar support for branch clocks.

Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
diff --git a/arch/arm/mach-msm/clock-local.h b/arch/arm/mach-msm/clock-local.h
index 58c76e9..a19277b 100644
--- a/arch/arm/mach-msm/clock-local.h
+++ b/arch/arm/mach-msm/clock-local.h
@@ -251,6 +251,7 @@
 	bool enabled;
 	struct branch b;
 	struct clk *parent;
+	struct clk *depends;
 	struct clk c;
 };