Credit units are based on UC systemwide policy. Subject credit is determined by the campus or division within the campus.
Berkeley L&S is somewhat unusual in that subject credit is determined by department with respect to students in its major(s). This can lead to situations where, for two majors that have some of the same prerequisites, one accepts AP scores for those prerequisites, but the other does not. For example, both of the large biology majors (MCB and IB) require similar lower division prerequisites, but MCB accepts AP scores for some of them, but IB does not accept any AP scores. Since you will be an applied math major, the only relevant AP score you have is calculus AB (and possibly calculus BC if you get a 5).
At the L&S level, AP scores are not accepted for the 7 course breadth requirement, though they are accepted for reading and composition, quantitative reasoning, and foreign language requirements: http://ls-advise.berkeley.edu/requirement/summary.html .