msm: spm: Do not fail in absence of vctl timeout node

Currently the spm probe fails for L2 if there is no vctl timeout
node present for it. To support targets with gang and individual rail
configuration remove the failure condition. Do not fail the device probe
if this node is not found.

Change-Id: I1625bc01c19bc136a9bacc2f3a3850cb10f9683d
Signed-off-by: Archana Sathyakumar <asathyak@codeaurora.org>