[Bug 254884] [if_smsc] Add ability to disable "turbo_mode" (RX frames batching) similar to linux driver

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254884

            Bug ID: 254884
           Summary: [if_smsc] Add ability to disable "turbo_mode" (RX
                    frames batching) similar to linux driver
           Product: Base System
           Version: CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: osidorkin at gmail.com

Created attachment 223924
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=223924&action=edit
Patch to add ability to disable "turbo mode" in if_smsc

"turbo  mode" makes chip to wait a while before transferring the frame in case
there are some other frames. This increases both throughput and rtt.

Linux driver has module param to disable batching if necessary.

Attached patch adds similar flag to freebsd driver.

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