Merge rbhma4200(RBTX4927/37) and rbhma4500(RBTX4938) defconfig into single rbtx49xx defconfig. And jmr3927 defconfig is also updated. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>