sh: move sh clock.c contents to drivers/sh/clk.

This patch is V2 of the SH clock framework move from
arch/sh/kernel/cpu/clock.c to drivers/sh/clk.c. All
code except the following functions are moved:
clk_init(), clk_get() and clk_put().

The init function is still kept in clock.c since it
depends on the SH-specific machvec implementation.

The symbols clk_get() and clk_put() already exist in
the common ARM clkdev code, those symbols are left in
the SH tree to avoid duplicating them for SH-Mobile ARM.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/include/asm/clock.h

@@ -10,4 +10,7 @@ int __init arch_clk_init(void);
 /* arch/sh/kernel/cpu/clock-cpg.c */
 int __init __deprecated cpg_clk_init(void);
 
+/* arch/sh/kernel/cpu/clock.c */
+int clk_init(void);
+
 #endif /* __ASM_SH_CLOCK_H */