mips: rename offsets.c to asm-offsets.c

Cannot build MIPS now.
We need to change offset.c to asm-offsets.c

Signed-off-by: Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/arch/mips/kernel/offset.c b/arch/mips/kernel/asm-offsets.c
similarity index 100%
rename from arch/mips/kernel/offset.c
rename to arch/mips/kernel/asm-offsets.c