MIPS: ralink: Don't include objects twice

With the change of platform file inclusion object were included via
platform-y and core-y. Remove the core-y part to fix it.

Fixes: 26bff9eb49201aeb ("MIPS: Only include the platformfile needed")
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
1 file changed