qdsp6v2: Use ADSP loader as in-kernel component using sysfs node

ADSP is loaded as a seperate module using insmod. Use adsp loader
as in-kernel component. Loading the adsp is triggered using sysfs
node. Once file system is loaded an entry is written to the sysfs
node. This triggers the registered callback function and loads
the ADSP.

Change-Id: Id25ae2c16a8f1de04136a44d2da5c319cf0173aa
Signed-off-by: Krishnankutty Kolathappilly <kkolat@codeaurora.org>