It is possible for other execution environments (EEs, like the modem)
to request changes to local (AP) channel or event ring state.  We do
not support this feature.

In gsi_irq_setup(), explicitly zero the mask that defines which
channels are permitted to generate inter-EE channel state change
interrupts.  Do the same for the event ring mask.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>