Be more aggressive about obtaining vold service.

vdc is typically invoked very early during boot, where it races with
vold starting up.  The default getService() implementation waits a
whole second between retrying, so write a local getServiceAggressive()
that only waits 10ms between attempts.

Test: builds, boots
Bug: 65737446
Change-Id: I581db3afcf7f81dd7cd9cc84dc03194759861669
1 file changed