microkernel: fix build issue when CONFIG_TASK_MONITOR=y

Note that the A->Comm is a pointer to the microkernel functions,
and thus is highly probable that the high 8-bit is occupied.
Therefore adds a new field in the monitor struct to store the pointer.

Change-Id: I7bcb34108c89a97cc38b2ac411ae4139b62786f3
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
3 files changed