CalendarView rendering: use R.styleable to find attr.

Not all attr are added to R.attr. This results in some attr not being
found and hence a broken rendering. Fix the issue by adding all attr
referenced in R.styleable to the map of attr before adding any remaining
values from R.attr.

Change-Id: I1ebf8a394b9e1edbf7490e011833d20a00d38317