Enable debug message in WallapeprManagerService to check wallpaper size

Print the input wallpaper size and generated wallpaper size to check if
wallpaper size is abnormal or not

BUG: 231468856
Test: 1. Build pass
      2. Check the log is printed successfully
Change-Id: Ia3f19444e45c146b960d2c2b17e84d181bf216bc