ShellPkg/Dp: Cumulate the perf data of "DB:Stop"

ShellPkg/Dp: Cumulate the perf data of "DB:Stop"

Currently DP tool will cumulate the performance data for
Driver Binding Support/Start, will count the number they
appears, and record the maximum/minimum time value...
Now add Driver Binding Stop performance data to the
cumulative data to keep consistency.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>