clk: ti: autoidle: move generic autoidle handling code to clock driver

This is no longer needed in platform directory, as the legacy clock data
is gone, so move it under TI clock driver. Some static functions are
renamed also.

Signed-off-by: Tero Kristo <t-kristo@ti.com>

arch/arm/mach-omap2/clock.h

@@ -186,9 +186,6 @@ void omap3_dpll_deny_idle(struct clk_hw_omap *clk);
 
 void __init omap2_clk_disable_clkdm_control(void);
 
-int omap2_clk_enable_autoidle_all(void);
-int omap2_clk_allow_idle(struct clk *clk);
-int omap2_clk_deny_idle(struct clk *clk);
 int omap2_clk_switch_mpurate_at_boot(const char *mpurate_ck_name);
 void omap2_clk_print_new_rates(const char *hfclkin_ck_name,
 			       const char *core_ck_name,