Use templates for write*Vector methods

Test: AIDL integration tests still pass
Bug: None
Signed-off-by: Casey Dahlin <sadmac@google.com>

(cherry picked from commit 5f0625695ce6999ec70f5699f70a8a0fa84a1bf6)

Change-Id: I902dd90faa77cba7a2212793bd26a3cfe49fc443
1 file changed