hla: Increase HLA_MAX_USB_IDS

hla: Increase HLA_MAX_USB_IDS

We are already at the limit for the number of VID/PID pairs declared
in stlink.cfg and stlink-dap.cfg. Increase the maximum number of pairs
from 8 to 16 to make room for a few more devices.

Signed-off-by: Andreas Sandberg <andreas@sandberg.uk>
Change-Id: Ifad8e7ef67b930edbb5421730f00eb3390812f06
Reviewed-on: https://review.openocd.org/c/openocd/+/6554
Tested-by: jenkins
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>