package/ti-cgt-pru: bump to 2.2.1

package/ti-cgt-pru: bump to 2.2.1

See: http://www.ti.com/tool/download/PRU-CGT-2-2

The ti-cgt-pru v2.1.x installer are affected by a bug with recent
distribution (Fedora 27 and Ubuntu 17.10) using kernel 4.13 or 4.14
with a glibc 2.26.
The installer is stuck in a futex(wait) system call.

While at it, add license hash.

Fixes:
http://autobuild.buildroot.net/results/68f/68f60ad38d9b6eae83b5d233966616a25d8c9391

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Ash Charles <ash.charles@savoirfairelinux.com>
Cc: Matthew Weber <matthew.weber@rockwellcollins.com>
Tested-by: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>