power: fg-util: Wait for soc_update completion upon timeout

Currently, wait for soc_update completion is attempted once again
only when the wait is interrupted. Try waiting again even when it
is timed out. This should help IMA_ATOMIC transactions go through
reliably.

Change-Id: I8d31fc41020b8c05ff4d562ae205eaa278d7ffcb
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>