phy: core: Let node ptr of PHY point to PHY and not of PHY provider

In case of multi-phy PHY providers, each PHY should be modeled as a sub
node of the PHY provider. Then each PHY will have a different node pointer
(node pointer of sub node) than that of PHY provider. Added this provision
in the PHY core.Also fixed all drivers to use the updated API.

Change-Id: I1c6ad35456cb1b06561c95e2de79559c0e49babb
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
[ygardi@codeaurora.org: merging with qcom-specific changes, and removing
non existing files]
Git-commit: f0ed817638b59aa927f1f7e9564dd8796b18dc4f
Git-repo: https://git.kernel.org/cgit/linux/kernel/git/kishon/linux-phy.git/


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