ARM: OMAP2+: use symbolic defines for console loglevels instead of numbers

<linux/printk.h> provides macros for console log level, let's use it
instead of numbers.
Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/serial.c

@@ -203,7 +203,7 @@ static int __init omap_serial_early_init(void)
 		if (cmdline_find_option(uart_name)) {
 			console_uart_id = uart->num;
 
-			if (console_loglevel >= 10) {
+			if (console_loglevel >= CONSOLE_LOGLEVEL_DEBUG) {
 				uart_debug = true;
 				pr_info("%s used as console in debug mode: uart%d clocks will not be gated",
 					uart_name, uart->num);