omap2/3/4: serial: fix coding style indentaion

No logical code change

Fix coding style indentaion as per checkpatch.pl
Fix multi-line comment style reported by Nishanth Menon
Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
Cc: Nishanth Menon <nm@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/serial.c

@@ -716,7 +716,8 @@ void __init omap_serial_init_port(int port)
 		DEV_CREATE_FILE(dev, &dev_attr_sleep_timeout);
 	}
 
-		/* omap44xx: Never read empty UART fifo
+	/*
+	 * omap44xx: Never read empty UART fifo
 	 * omap3xxx: Never read empty UART fifo on UARTs
 	 * with IP rev >=0x52
 	 */