msm: kgsl: fix 2d IB processing

The 2d hardware handles ringbuffer and IB commands as
a series of gotos. At the end of each IB, there must
be a goto command back to the ringbuffer, which must
be "monkey patched" into the IB by the driver.
Fix this code to use a proper kernel mapping.

Change-Id: Ic35e6fbf6baeef51dbc2497f1702c7ccd6997579
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>