NFC: don't reparse device tree

probe function parses device tree at the begginning. device tree should not
be reparsed in the middle of the probe.  use the first parse value.

Change-Id: I6695d76c9b05ec9ba2d8f73ee0815ab86078da31
Signed-off-by: Houston Hoffman <hhoffman@codeaurora.org>