multicore build error (13)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 0d18b60bd151 Add support for SIMCom SIM7600. To issue AT c..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=101764bb300000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=5b05d09fba6c8e8512d3

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5b05d0...@syzkaller.appspotmail.com

sys/dev/usb/if_umb.c:260:25: error: use of undeclared identifier 'USB_PRODUCT_SIMCOM_SIM7600'
sys/dev/usb/if_umb.c:303:10: error: invalid application of 'sizeof' to an incomplete type 'const struct umb_quirk []'
sys/dev/usb/if_umb.c:359:10: error: invalid application of 'sizeof' to an incomplete type 'const struct umb_quirk []'

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[Greg Steuck]

#syz fix: regen