[qca-nss-drv] Fix invalid pointer typecast for callback_t in msg_init APIs

msg_init() APIs don't need a typecast for callbacks. Fix the invalid typecast
for all the callbacks in msg_init.

Change-Id: I58fcdba29acf0848ec4cdc103bfcd14612f10b40
Signed-off-by: Sundarajan Srinivasan <sundaraj@codeaurora.org>
14 files changed