Revert "integration of the GPU option (environnement not compatible with CMSSW yet)"

This reverts commit 4292e6b10a7e4dc26479288cd3ec48abf66ed03b.
Revert "Starting a GPU version of the pattern recognition - still in developpement"

This reverts commit a43c2d3190f3ba03f9604f5e61e664491cf84978.