[MIPS] TXx9: rename asm-mips/mach-jmr3927 to asm-mips/mach-tx39xx

Rename mach-jmr3927 directory to more proper name to make adding other
platforms easier.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
7 files changed