msm: spm-v2: Disable AVS operations on unsupported targets

Do not enable/disable AVS on targets where it is not enabled at boot.
Enabling it on targets when AVS isn't enabled and the AVS control
parameters aren't configured, causes undefined behavior and random
crashes.

Change-Id: I05576d62fc54cbe41737c8bdf3c09b818a4d3fb1
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>