fs_mgr: remount: log to stderr and logd

Logging normally goes to stderr, also send output redirected to the
Android Logger.  Required if command is exec'd, useful if commanded
from shell.

Test: manual confirmation of both outputs.
Bug: 122602260
Change-Id: Ibc2e14bd4fad561514c0c33741da8ca6f00af3f3
1 file changed