target/mips: Separate CP0-related helpers into their own file

For clarity and easier maintenence, create target/mips/cp0_helper.c, and
move all CP0-related content form target/mips/op_helper.c to that file.

Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: Aleksandar Rikalo <aleksandar.rikalo@rt-rk.com>
Message-Id: <1580745443-24650-2-git-send-email-aleksandar.markovic@rt-rk.com>

target/mips/Makefile.objs

@@ -1,5 +1,6 @@
-obj-y += translate.o dsp_helper.o op_helper.o lmi_helper.o helper.o cpu.o
-obj-y += gdbstub.o msa_helper.o
+obj-y += translate.o cpu.o gdbstub.o helper.o
+obj-y += op_helper.o cp0_helper.o
+obj-y += dsp_helper.o lmi_helper.o msa_helper.o
 obj-$(CONFIG_SOFTMMU) += mips-semi.o
 obj-$(CONFIG_SOFTMMU) += machine.o cp0_timer.o
 obj-$(CONFIG_KVM) += kvm.o