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: I21cee619919e071a66d15840632f972b1e89c58e