Support Full-Duplex SPI on ili9341 and xpt2046 ESP32 drivers

[amirgon]

When SPI bus is shared with other devices, it might be useful to configure it as full-duplex.
Currently it's configured as half-duplex because half-duplex supports the dummy-bit workaround with speeds up to 80Mhz.
However, since ili9341 only writes, we could configure it to full-duplex and enable the SPI_DEVICE_NO_DUMMY bit to support up to 80Mhz write only.

Half duplex configuration may be related to difficulties supporting SPI SD card on the same bus with ili9341.

Related:

• https://forum.lvgl.io/t/fyi-about-dma-issues-on-esp32/2583
• Can't mount SD card and display at the same time when sharing the same SPI bus #69

[stale]

This issue or pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue or pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.