BaseTools:BaseTools supports to the driver combination.
    
    BZ:https://bugzilla.tianocore.org/show_bug.cgi?id=1520
    
    To save the image size without the compression, more than
    one drivers can be combined into single one. When more than
    one drivers are combined, their depex will be AND together.
    Below is the example to combine BootManagerPolicyDxe into
    DriverHealthManagerDxe.
    
    Besides this patch, BaseTools also needs to check the module
    type and make sure all module type are same. Otherwise,
    BaseTools will report the error.
    DRIVER INF has the parameter ENTRY_POINT
    LIBRARY INF has the parameter LIBRARY_CLASS
    
    Cc: Liming Gao <liming.gao@intel.com>
    Contributed-under: TianoCore Contribution Agreement 1.1
    Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>
    Reviewed-by: Liming Gao <liming.gao@intel.com>