Raise "Report Count" value limit in HID descriptor parser.

This fixes usage/report size calculation of Microsoft`s "Touch Hardware
Quality Assurance" certificate blob found in many touchscreens.

While here, join several "c->flags = dval" lines in to single line.

Reviewed by: hselasky
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D16357