ARM: add support for Allwinner A10 interrupt controller

Untested so far.

Change-Id: I3453115599cf2112858a194173212401ae4ac1b7
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5104
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
Reviewed-by: David Karoly <karolyd577@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

boot/efi/dtb: implement interrupt controller detection

Change-Id: I045a94c5bcb7c16297bc6fdd1fa2981e5b3f3a62
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4756
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>