git: u4b: Sync usb_busdma.[ch] with FreeBSD

[Aaron LI]

commit c0855296306b3903be09ca649d8a9e7108be1b47
Author: Aaron LI <aly at aaronly.me>
Date:   Fri May 8 20:04:58 2026 +0800

    u4b: Sync usb_busdma.[ch] with FreeBSD

Summary of changes:
 sys/bus/u4b/usb_busdma.c | 69 ++++++++++++++++++++++++++----------------------
 sys/bus/u4b/usb_busdma.h | 13 +++++----
 2 files changed, 43 insertions(+), 39 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/c0855296306b3903be09ca649d8a9e7108be1b47


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