ASoC: wcd_cpe: Add CPE FTM feature

Add debugfs nodes for CPE FTM.
The callback will load the instruction and execute it.
CPE status will be retrieved and be read by userspace.
New CPE service command validation is added to guarantee
the concurrency of CPE FTM and normal CPE SVA detection.

Change-Id: I0748e357a21d873af5a85bbb80e982db0323beb7
Signed-off-by: Walter Yang <yandongy@codeaurora.org>