Move dump() to dumpAsync(), more oneway calls.

When calling out to dump services hosted by external apps, use
dumpAsync() to avoid hanging if the remote process is wedged.

(cherry picked from commit 850c83e6)

Test: builds, boots, runs with minimal logs triggered
Bug: 32715088

Merged-In: I70aa2666ae21dae8f09ded2063bed359c0b210c5

Change-Id: Ic2be10dc8478d613cea6e2c976b9987c250b86b7