Revert "phy: fix wrong return value of phy framework APIs"

This reverts commit 15a373ce.

This change reverts changes in the generic PHY framework.
Many changes were uploaded into the generic PHY framework in the
upstream code.
In order to avoid conflicts, we need to revert this patch, then
cherry-pick the changes of generic PHY framework from the upstream.

Change-Id: I04cc1771c67d4f47be875b3ccf6f01348efd0905
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>