net: miiphybb: Wrap driver side bb_miiphy_read/write() accessors

net: miiphybb: Wrap driver side bb_miiphy_read/write() accessors

Do not call bb_miiphy_read()/bb_miiphy_write() accessors directly
in drivers, instead call them through wrapper functions. Those are
meant to be used as function parameter adaptation layer between
struct mii_dev callback function parameters and what the miiphybb
does expect and will soon expect. This is a preparatory patch, no
functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Paul Barker <paul.barker.ct@bp.renesas.com>