msm: pil-q6v4: Remove 8960v1.0 hardware workaround

The first version of 8960 silicon required auto-gating for
Q6SS_AXIS_ACLK to be disabled as part of the PIL reset sequence. Since
this HW issue was resolved in later silicon versions, and the version
with the issue was never productized, remove the unnecessary code.

Change-Id: I27a9d48335d499c0763a2c5cb4640f9e559681b2
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>