[JFFS2] Remove dead file histo_mips.h

Its contents were subsumed into compr_rubin.c in a previous
commit, but I forgot to git-rm it.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/fs/jffs2/histo_mips.h b/fs/jffs2/histo_mips.h
deleted file mode 100644
index fa3dac1..0000000
--- a/fs/jffs2/histo_mips.h
+++ /dev/null
@@ -1,2 +0,0 @@
-#define BIT_DIVIDER_MIPS 1043
-static int bits_mips[8] = { 277,249,290,267,229,341,212,241}; /* mips32 */