Revert gps.omap4.so and sirfgps.conf updates.

These files were aimed at maguro and seem to be causing problems with
toro. The previous gps.omap4.so was from 4.0.4, so I updated that to
match the 4.1.1 OTA as well.

I have been running this for several days now and it has greatly improved my GPS response times and stability.

Change-Id: Ib4b3040b8100859ab3a019efe9b3a2d63e9fbec1