sysutils/opensbi: update to v1.3.1

Add a patch to work around an assembler error with clang 16.0. This will
be submitted upstream.

As usual, bump revision of dependent u-boot ports.

Reviewed by: jrtc27, lwhsu (previous version)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D40915