Add .gitignore files for MIPS.
diff --git a/arch/mips/boot/.gitignore b/arch/mips/boot/.gitignore
new file mode 100644
index 0000000..ba63401
--- /dev/null
+++ b/arch/mips/boot/.gitignore
@@ -0,0 +1,4 @@
+mkboot
+elf2ecoff
+zImage
+zImage.tmp