Remove stmmac change from net-phy-Support-yt8531c.patch as its causing 32-bit allwinner boards to hang on boot

Description

The 32-bit allwinner boards are known to hang with 6.1.30 kernel. On investigation, I was able to narrow the issue down to the above mentioned patch. The patch is supposed to add support for yt8531c, but it was also modifying stmmac ethernet driver to add a fix for realtek chip. This doesn't make sense to me and removing that code solved the issue.

Jira reference number AR-1764

How Has This Been Tested?

Created an bookworm current image for nanopi duo2 with and without stmmac part removed.

• [X] Removing the stmmac part of the patch results into board booting successfully
• [X] Restoring the stmmac part of the patch causes the board to hang

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [X] Any dependent changes have been merged and published in downstream modules

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