Move check-api to definition.mk

1) Move check-api to definition.mk, so it can be used in other places.
2) Add additional dependency to the api-stub module to consolidate the
apicheck dependency. Previously you have to run 2 "make"s in a row and
only in the 2nd run apicheck is run, due to a gnu-make optimization.

Bug: 7540265
Change-Id: Ib24ed87d9330027a9f95ed7b16dd4002cc0e3198