phy: ti: phy-j721e-wiz: Allow reinitialization when SERDES is pre-configured

phy: ti: phy-j721e-wiz: Allow reinitialization when SERDES is pre-configured

Move the SERDES configuration check after clock and reset initialization
and change it from a hard failure to a skip of WIZ initialization. This
allows the driver to probe successfully when the SERDES has been
pre-configured by a previous boot stage (e.g., ROM or SPL).

This approach aligns with how the Linux kernel handles pre-configured
SERDES, where the driver gracefully skips reinitialization rather than
failing to probe.

Signed-off-by: Hrushikesh Salunke <h-salunke@ti.com>