ARM: OMAP2xxx: clock: remove global 'dclk' variable

Remove the global 'dclk' variable, instead replacing it with a
variable local to the dpllcore clock type C file.  This removes some
of the special-case code surrounding the OMAP2xxx clock init.

This patch is a prerequisite for the removal of the
omap_prcm_restart() code from arch/arm/mach-omap2/prcm.c.  It also
cleans up some special-case OMAP2xxx clock code in the process.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Vaibhav Hiremath <hvaibhav@ti.com>
diff --git a/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c b/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c
index c66276b..3115994 100644
--- a/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c
+++ b/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c
@@ -118,7 +118,7 @@
 	}
 
 	curr_prcm_set = prcm;
-	cur_rate = omap2xxx_clk_get_core_rate(dclk);
+	cur_rate = omap2xxx_clk_get_core_rate();
 
 	if (prcm->dpll_speed == cur_rate / 2) {
 		omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1);