Zero hidl-generated structs

Bug: 131356202
Test: boot, lshal
Change-Id: I8fb10532b6fdf9afa419f19fc634981e7cbd3c10
Merged-In: I8fb10532b6fdf9afa419f19fc634981e7cbd3c10
(cherry picked from commit da1d449882f654137cb265acc8fa6fdd80001de7)
(cherry picked from commit 215f43f66dc9838bccd8937867568e725d317036)