Makes all global data in tokenize.c const

Removes all runtime initialization of global data in tokenize.c.
DCT token and cost tabels are pre-generated.

Second patch in a series to make sure code is reentrant.

Change-Id: Iab48b5fe290129823947b669413101f22a1bcac0
diff --git a/vp8/vp8cx.mk b/vp8/vp8cx.mk
index 2e940d7..b7f3494 100644
--- a/vp8/vp8cx.mk
+++ b/vp8/vp8cx.mk
@@ -78,6 +78,8 @@
 VP8_CX_SRCS-yes += encoder/segmentation.h
 VP8_CX_SRCS-$(CONFIG_INTERNAL_STATS) += encoder/ssim.c
 VP8_CX_SRCS-yes += encoder/tokenize.c
+VP8_CX_SRCS-yes += encoder/dct_value_cost.h
+VP8_CX_SRCS-yes += encoder/dct_value_tokens.h
 VP8_CX_SRCS-yes += encoder/treewriter.c
 VP8_CX_SRCS-$(CONFIG_INTERNAL_STATS) += common/postproc.h
 VP8_CX_SRCS-$(CONFIG_INTERNAL_STATS) += common/postproc.c