zynqmp: pm: Added NODE_IPI_APU slave node ID in pm_defs.h
zynqmp: pm: Added NODE_IPI_APU slave node ID in pm_defs.h

NODE_IPI_APU is the node ID of APU's IPI device. If APU should be
woken-up on an IPI from FPD power down, this node shall be set as
the wake-up source upon suspend.

Signed-off-by: Mirela Simonovic <789a56bf0be082732c408d9b08112674350ff427@aggios.com>

lsigithub/arm-trusted-firmware_public,sbranden/arm-trusted-firmware,achingupta/arm-trusted-firmware,lsigithub/arm-trusted-firmware_public,achingupta/arm-trusted-firmware,sbranden/arm-trusted-firmware