Exif API: Changes

The following header file(s) have changed between 3.0 and 3.1

**Table 1:** exifmodify.h
Type	Class	Change
New enum	`CExifModify`	`TExifModifyOption`
New public method	`CExifModify`	`static CExifModify* NewL(const TDesC8& aInData, CExifModify::TOperationMode aOperationMode, TUint aExifModifyOption );`

**Table 2:** exifread.h
Type	Class	Change
New enum	`CExifRead`	`TExifReadOption`
New public method	`CExifRead`	`static CExifRead* NewL( const TDesC8& aExifData, TUint aExifReadOption );`