MFC r306899, r307059, r307151

r306899:
Fix release MSI method for ARM GIC

r307059:
INTRNG - fix MSI/MSIX release path

Use isrc in attached MSI data structure instead of using map's
isrc directly. map's isrc is set to NULL on IRQ deactivation
which happens prior to pci_release_msi so MSI_RELEASE_MSI
receives array of NULLs

Reviewed by: mmel
Differential Revision: https://reviews.freebsd.org/D8206

r307151:
INTRNG: Propagate IRQ activation error to API consumer

Keep resource state consistent with INTRNG state - if intr_activate_irq
fails - deactivate resource and propagate error to calling function

Reviewed by: mmel