ARM: OMAP2: Remove redundant check on osc refcount

The usage of the external oscillator is handled already by
sleep_block and doesn't require any extra checking.
Incidentally this fixes a bug where N800 wouldn't enter retention
the first time the display would blank.
Signed-off-by: Klaus Pedersen <klaus.k.pedersen@nokia.com>
Signed-off-by: Igor Stoppa <igor.stoppa@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/pm.c

@@ -616,8 +616,6 @@ static int omap2_can_sleep(void)
 		return 0;
 	if (atomic_read(&sleep_block) > 0)
 		return 0;
-	if (clk_get_usecount(osc_ck) > 1)
-		return 0;
 	if (omap_dma_running())
 		return 0;