liblog: use int32_t and uint32_t for new NDK APIs

As requested during the API review.

Bug: 150898477
Test: liblog and libbase unit tests
Merged-In: I0c1dd57f7499e432bb881e1da1beb55f1ff7de05
Change-Id: I0c1dd57f7499e432bb881e1da1beb55f1ff7de05
(cherry picked from commit f1a975bece11df9ad900e0ddde0c9ec75e297d53)
5 files changed