Move additional functions to shared library in preparation for qca808x
PHY Family to be detached from at803x driver.

Only the shared defines are moved to the shared qcom.h header.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20240129141600.2592-5-ansuelsmth@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>