Revert "of: cache phandle nodes to reduce cost of of_find_node_by_phandle()"

This reverts commit f7642c6a.

Original author credentials got missed inadvertently in this commit. So,
revert this commit and update new commit with proper credentials.

Change-Id: Ice9e825b7bd181eb2393a26fd317673916737851
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>