sh: clkfwk: Wire up clk_get_sys() support.

This stubs in clk_get_sys() from the ARM clkdev implementation.
Tentatively conver the clk_get() lookup code to use this, and once the
rest of the in-tree users are happy with this, it can replace the
fallback lookups.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/include/asm/clock.h

@@ -37,6 +37,13 @@ struct clk {
 	unsigned long		arch_flags;
 };
 
+struct clk_lookup {
+	struct list_head	node;
+	const char		*dev_id;
+	const char		*con_id;
+	struct clk		*clk;
+};
+
 #define CLK_ENABLE_ON_INIT	(1 << 0)
 
 /* Should be defined by processor-specific code */