Revert "board-omap4panda.c: omap_vwlan_device define but not used"

This reverts commit 9f511b427ac480ce5ba1b357c9459bd1844f52c0.
arch:arm:mach-omap2: disable 153MHz gpu step to fix GPU governor

With this active it would only boost to 384MHZ since it has only 3 steps
and 307MHz uses the same voltage.