This commit increases the stack size for thread handling the host
commands requests. It was required due to the stack being
corrupted using earlier default size. The thread priority is now
configurable using the Kconfig.
It also adds alignment to the tx_buffer since the npcx MCU requires it
to work correctly and removes clearing the buffer before use due to
the hard time requirements. Tests checking if buffers are cleared
are also removed.
Signed-off-by: Michał Barnaś <mb@semihalf.com>
369596dc95