ESP32: Dual-SPI broken

[bjoernQ]

Running the spi_halfduplex_read_manufacturer_id example gives wrong results for Dual

Single [c8, 16]
Dual [20, 5b]
Quad [c8, 16]

While I'm sure I tested this before I get the same results with older esp-hal version. (But note: I am using a different flash chip now since I fried the one I used for testing, but it works fine for e.g. ESP32-C3, ESP32-S2, ESP32-C6 so it's not generally the flash chip's fault)

[Dominaezzz]

Might be time to improve the HIL tests, maybe we can use the slave driver to properly test the master driver.
I suppose this won't work for chips with just one SPI peripheral

[bugadani]

To clarify the title, ESP32 is broken, not dual spi