clk: ti: move generic OMAP DPLL implementation under drivers/clk

With the legacy clock data now gone, we can start moving OMAP clock
type implementations under clock driver. Start this with moving the
generic OMAP DPLL clock type under TI clock driver.

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

include/linux/clk/ti.h

@@ -286,7 +286,6 @@ long omap4_dpll_regm4xen_determine_rate(struct clk_hw *hw,
 					unsigned long max_rate,
 					unsigned long *best_parent_rate,
 					struct clk_hw **best_parent_clk);
-u8 omap2_init_dpll_parent(struct clk_hw *hw);
 unsigned long omap3_dpll_recalc(struct clk_hw *hw, unsigned long parent_rate);
 long omap2_dpll_round_rate(struct clk_hw *hw, unsigned long target_rate,
 			   unsigned long *parent_rate);