net: phy: dp83tg720: remove redundant 600ms post-reset delay

Now that dp83tg720_soft_reset() introduces role-specific delays to avoid
reset synchronization deadlocks, the fixed 600ms post-reset delay in
dp83tg720_read_status() is no longer needed.

The new logic provides both the required MDC timing and link stabilization,
making the old empirical delay redundant and unnecessarily long.

Co-developed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: David Jander <david@protonic.nl>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20250612104157.2262058-3-o.rempel@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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