[roll] Roll zircon 2a65e24..3a9f187 (3 commits)

3a9f187 [fs] Utilize fidl::BindMember template instead of macro
61c0f39 [minfs] Utilize fidl::BindMember template function instead of macro
af1bb53 [fidl] Add C++ wrappers around FIDL bind

Test: CQ

Change-Id: Iffbcd60a35d15d9020c12572248c4c41085ec459
1 file changed