Fix App Ops permission mapping structure.

The entry to map the post notification op
to a permission is at the wrong offset
within the sOpPerms array. This patch
fixes the issue.

Change-Id: Ia241d274e484b6a24edbfb17b87bb887b61f1ee1
Signed-off-by: rpcraig <rpcraig@tycho.ncsc.mil>
core: fix arithmetic on a pointer to void

Use char* instead of void* for this
pointer arithmetic. Fixes the following:

error: arithmetic on a pointer to void
buf = buf + offset;
      ~~~ ^

Change-Id: I6cfc92c9240fda66a52e780cda7820fdba76914a