m32r: Rearrange platform-dependent codes

Rearrange platform-dependent codes from arch/m32r/kernel/*.c
to arch/m32r/platforms/{platform}/.

Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
diff --git a/arch/m32r/platforms/m32104ut/Makefile b/arch/m32r/platforms/m32104ut/Makefile
new file mode 100644
index 0000000..0de5908
--- /dev/null
+++ b/arch/m32r/platforms/m32104ut/Makefile
@@ -0,0 +1 @@
+obj-y	:= setup.o io.o