[ARM] pxa: fix pxafb build when cpufreq is enabled

If cpufreq is enabled, pxafb wants to call the removed
get_clk_frequency_khz() function for a debug printk.  Remove
this reference.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
index 48aea39..3ee314b 100644
--- a/drivers/video/pxafb.c
+++ b/drivers/video/pxafb.c
@@ -355,9 +355,8 @@
 	}
 
 #ifdef CONFIG_CPU_FREQ
-	pr_debug("pxafb: dma period = %d ps, clock = %d kHz\n",
-		 pxafb_display_dma_period(var),
-		 get_clk_frequency_khz(0));
+	pr_debug("pxafb: dma period = %d ps\n",
+		 pxafb_display_dma_period(var));
 #endif
 
 	return 0;