OMAP2/3/4 clock: omap2_clk_prepare_for_reboot() is OMAP2xxx-only

omap2_clk_prepare_for_reboot() is only applicable to OMAP2xxx chips,
so rename it to omap2xxx_clk_prepare_for_reboot() and only call it when
running on OMAP2xxx chips.  Remove the old stub in the OMAP3 clock code.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index 8a7db7a..34d3950 100644
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -150,25 +150,6 @@
 	return omap3_noncore_dpll_set_rate(clk, rate);
 }
 
-/* Common clock code */
-
-/*
- * Set clocks for bypass mode for reboot to work.
- */
-void omap2_clk_prepare_for_reboot(void)
-{
-	/* REVISIT: Not ready for 343x */
-#if 0
-	u32 rate;
-
-	if (vclk == NULL || sclk == NULL)
-		return;
-
-	rate = clk_get_rate(sclk);
-	clk_set_rate(vclk, rate);
-#endif
-}
-
 void omap3_clk_lock_dpll5(void)
 {
 	struct clk *dpll5_clk;
@@ -191,6 +172,8 @@
 	return;
 }
 
+/* Common clock code */
+
 /* REVISIT: Move this init stuff out into clock.c */
 
 /*