fix(board): Fix wESP32 board config with new options

[xorbit]

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Description of Change

• Provide flash size option to choose 4MB flash (rev 5 and below) or 16MB flash (default, rev 7 and higher).
• Provide appropriate partition scheme options to effectively use either 4MB or 16MB flash sizes.
• Change default Ethernet PHY from LAN8720 to RTL8201 (rev 7 and higher default).

Test Scenarios

Tested on Arduino 2.3.6 locally with wESP32 rev 8 board.

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[P-R-O-C-H-Y]

What about having also #define ETH_PHY_TYPE_REV4 ETH_PHY_LAN8720 in case someone uses the old revision to keep backward compatibility.

[xorbit]

In my examples, I have usually called out just setting all parameters:
https://wesp32.com/software/#arduino-esp32

With the change in this PR, users now could just use ETH.begin() for any wESP32 sold in the last 4 years.

The only revisions ever sold are rev 3, 4 and 5 with LAN8720, sold for about 3 years (2018 ~ 2021), and rev 7 and 8 with RTL8201, sold the last 4 years (2021 ~ present). I'm not sure how to clearly communicate what another define would be for exactly. It's not just revision 4, it's 3, 4 and 5 you'd use LAN8720 for. I don't see how any new #define we'd come up with would be clearer than to just say "this board needs LAN8720" and use the ETH_PHY_LAN8720 name directly.