atspi: Add Elm_Atspi_Reading_Info_Type_Mask

atspi: Add Elm_Atspi_Reading_Info_Type_Mask

   The elm_atspi_accessible_reading_info_type_set could get result value of bitwise
   operation. If the elm_atspi_accessible_reading_info_type_set allows only enum
   Elm_Accessible_Reading_Info_type, then g++ complains with following error:

   invalid conversion from 'int' to 'Elm_Accessible_Reading_Info_Type' [-fpermissive]

   So the elm_atspi_accessible_reading_info_type_set should change its parameter
   from Elm_Accessible_Reading_Info_Type to Elm_Atspi_Reading_Info_Type_Mask.
   The Elm_Atspi_Reading_Info_Type_Mask is unsigned int type.

Change-Id: Ibadb4effe3ac46b5aaa806bcac0002b9f68d1b76