Revert "Update powervr.ini"

This reverts commit 0162db96a0ccf6a530c4eba7665abd7173360cf6.
Alter blobs so that 26mhz BT firmware doesn't load.
For me, BT would only work using the 20mhz file (which is also loaded by stock).

Change-Id: I0f018e544c952a9efe8e4aa3901ea95a120ca677