DRVSEL and SMPLSEL needs to be set so that it can properly go into full
speed mode. This needs to be done in EL3 as the registers are secured.
Signed-off-by: Tien Hock Loh <tien.hock.loh@intel.com>
Change-Id: Ia2f348e7742ff7b76da74d392ef1ce71e2f41677