soc: qcom: socinfo: handle 'too new' format versions gracefully

Presently, if the bootchain updates the socinfo format version,
a corresponding change to the Linux soconfi driver must first be
made to avoid an "Unknown format found" error.

Avoid this by taking advantage of the fact that new format versions
with the same major version number are defined to be backward-
compatible with older formats having the same major number.

Change-Id: I985a46eeefaacd3425bbc17f72fe09b86264f8b1
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>