Linux, Solaris, and FreeBSD driver 415.27 [short-lived branch release]

Release highlights since 415.25:

    * Added support for the following GPU: * GeForce RTX 2060
    • Added a new kernel module parameter, NVreg_RestrictProfilingToAdminUsers,
      to allow restricting the use of GPU performance counters to system
      administrators only.

[README | Linux x86_64 | Solaris | FreeBSD x86_64]