clk: highbank: Include clk.h

This clock provider uses the consumer API, so include clk.h
explicitly.

Cc: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>

drivers/clk/clk-highbank.c

@@ -17,6 +17,7 @@
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/err.h>
+#include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/io.h>
 #include <linux/of.h>