init.shamu.rc:  Add "mdm_helper_proxy" to add a vote for mdm to power up

Add mdm_helper_proxy which can vote for MDM to stay powered up in case
of runtime restart (decryption).

It needs to do this only after RIL is running to avoid racing with
mdm_helper proper.

Bug: 17411623 took a long time to camp on network
Change-Id: I88b6d049b673c972d4717fe9f40c2e80cfb33863
2 files changed