net: ethernet: ti: am65-cpsw: Handle -EPROBE_DEFER for Serdes PHY

In the am65_cpsw_init_serdes_phy() function, the error handling for the
call to the devm_of_phy_get() function misses the case where the return
value of devm_of_phy_get() is ERR_PTR(-EPROBE_DEFER). Proceeding without
handling this case will result in a crash when the "phy" pointer with
this value is dereferenced by phy_init() in am65_cpsw_enable_phy().

Fix this by adding appropriate error handling code.

Reported-by: Geert Uytterhoeven <[email protected]>
Fixes: dab2b265dd23 ("net: ethernet: ti: am65-cpsw: Add support for SERDES configuration")
Suggested-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Siddharth Vadapalli <[email protected]>
Reviewed-by: Roger Quadros <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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