net: dsa: microchip: Replace ksz9477_wait_vlan_ctrl_ready polling with regmap

Regmap provides polling function to poll for bits in a register. This
function is another reimplementation of polling for bit being clear in
a register. Replace this with regmap polling function. Moreover, inline
the function parameters, as the function is never called with any other
parameter values than this one.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Andrew Lunn <[email protected]>
Cc: Florian Fainelli <[email protected]>
Cc: Tristram Ha <[email protected]>
Cc: Woojung Huh <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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