MIPS: unify CPU code in arch/mips/cpu/

Unify and move code in arch/mips/cpu/mips[32|64]/ to arch/mips/cpu/.
The CPU specific config.mk files need to remain until
CONFIG_STANDALONE_LOAD_ADDR is converted to a global Kconfig symbol.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/cpu/Makefile b/arch/mips/cpu/Makefile
new file mode 100644
index 0000000..fc6b455
--- /dev/null
+++ b/arch/mips/cpu/Makefile
@@ -0,0 +1,9 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+extra-y	= start.o
+
+obj-y += time.o
+obj-y += interrupts.o
+obj-y += cpu.o