Revert "phy: extend APIs of the generic phy framework"

This reverts commit 63566d8d.

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: Idbbe331255f8199f0869bcb76d7ad00767fb83e1
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>