msm: cvp: Avoid CVP loading at boot

CVP firmware has not been released to Lahaina. Loading CVP
firmware caused stability problem during kernel boot. Disable
CVP firmware loading till it's ready.

Change-Id: Iefef7a42c2a8f2cc1c20a259491b0d96248f1aa1
Signed-off-by: George Shen <sqiao@codeaurora.org>