Refactor Broadcom drivers for Tuna

There appears to be a difference between Maguro and Toro
binaries for the broadcom driver.  Not sure why.
This moves the tuna driver to maguro and uses the
toro driver from Googles most recent release as of this
merge for toro and toroplus.

Change-Id: I02dad89222fcf5f589d9666d1ed18f5e32cc420c
Signed-off-by: Zaphod <mwilson@acesappraisal.com>
Merge "Refactor Broadcom drivers for Tuna" into jb-mr1