mips: select REALTEK_OTTO_TIMER for Realtek platforms

When MACH_REALTEK_RTL is selected automatically select the
REALTEK_OTTO_TIMER option in order to support the Realtek platforms that
require it.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/Kconfig

@@ -667,6 +667,7 @@ config MACH_REALTEK_RTL
 	select BOOT_RAW
 	select PINCTRL
 	select USE_OF
+	select REALTEK_OTTO_TIMER
 
 config SGI_IP22
 	bool "SGI IP22 (Indy/Indigo2)"