docs(spm): interrupt handling guidance FF-A v1.1 EAC0

This patch documents the actions taken by Hafnium SPMC in response
to non-secure and secure interrupts.

Change-Id: I97687f188ca97aeb255e3e5b55d44ddf5d66b6e0
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
1 file changed