[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>

drivers/video/pxafb.c

@@ -355,9 +355,8 @@ static int pxafb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 	}
 
 #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;