applypatch: Change the ssize_t length parameters to size_t.

Mostly for applypatch family APIs like ApplyBSDiffPatch() and
ApplyImagePatch(). Changing to size_t doesn't indicate they would
necessarily work with very large size_t (e.g. > ssize_t), just
similar to write(2). But otherwise accepting negative length doesn't
make much sense.

Also change the return type of SinkFn from ssize_t to size_t. Callers
tell a successful sink by comparing the number of written bytes against
the desired value. Negative return values like -1 are not needed. This
also makes it consistent with bsdiff::bspatch interface.

Test: recovery_component_test
Test: Apply an incremental with the new updater.
Change-Id: I7ff1615203a5c9854134f75d019e266f4ea6e714

tests/component/imgdiff_test.cpp

@@ -27,7 +27,7 @@
 
 using android::base::get_unaligned;
 
-static ssize_t MemorySink(const unsigned char* data, ssize_t len, void* token) {
+static size_t MemorySink(const unsigned char* data, size_t len, void* token) {
   std::string* s = static_cast<std::string*>(token);
   s->append(reinterpret_cast<const char*>(data), len);
   return len;