ARM: OMAP: fix OMAP1 dmtimer build warning

Remove the OMAP1 version of omap_dm_timer_get_fclk(), and its associated
compile-time warning.  It would only BUG() if called, while it's only
called on OMAP2.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/dmtimer.c

@@ -271,11 +271,6 @@ int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
 
 #if defined(CONFIG_ARCH_OMAP1)
 
-struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
-{
-	BUG();
-}
-
 /**
  * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
  * @inputmask: current value of idlect mask