tegra2: add missing strcpy and strcat

These applets are no more common since recent optimisations

strcpy from cortex-a9
strcat : keep standard one

Change-Id: Icfedf17aa4f9fa30e7f63b19bd6d4ac533e5e0e9
don't hardcode register r0/v1 when reading the TLS

this leads to much improved code when calling __get_tls()

Change-Id: I21d870fb33c33a921ca55c4e100772e0f7a8d1e4