msm: kgsl: Use correct version number for pfp microcode

The pfp microcode supports bootstrap loading starting from its
version 0.83. Version 0.91 will not ever be released.

Change-Id: I5efc0f73cc81cbf11f205ef74ba59518140785e0
Signed-off-by: Vladimir Razgulin <vrazguli@codeaurora.org>