[ACTIVITY] report week ending 28 Mar

Progress (short week, 3 days): * UM-2 [QEMU upstream maintainership] - more FEAT_NMI patchset review: done with the physical interrupt parts, haven't looked at the virtual interrupt parts yet - usual release related effort - investigated and fixed a bug where we were taking HSTR traps to the wrong EL - noticed a minor GIC bug where HPPIR reads weren't honouring the interrupt-group-disable bits; sent a patch - reviewed the latest STM32L4x5 UART patchset

-- PMM