msm: footswitch-8x60: Update 8064 footswitch_enable() sequence for GFX3D

Update 8064's GFX3D enable sequence per hardware designer recommendations
to improve system stability when responding to the inrush current event.

Differences from the standard footswitch_enable() sequence include:
 - Decreasing the reset_rate from 27MHz to 1.8MHz, and increasing
   reset_delay_us from 1us to 10us to compensate for the slower clock.
 - Enable clocks for reset propagation only after the core has been
   powered on.
 - Forcefully limit the AFAB and EBI1 clocks to a low value (decided
   by the RPM) by means of a write to the RPM_CTL RPM resource.
 - Removal of the reset toggle after powering on the core, which (while
   harmless) is not applicable to 8064.

Change-Id: I943842b56ff96b2e6077a419566d91ac184a6fda
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>