CVE-2023-52511

In the Linux kernel, the following vulnerability has been resolved: spi:
sun6i: reduce DMA RX transfer width to single byte Through empirical
testing it has been determined that sometimes RX SPI transfers with DMA
enabled return corrupted data. This is down to single or even multiple
bytes lost during DMA transfer from SPI peripheral to memory. It seems the
RX FIFO within the SPI peripheral can become confused when performing bus
read accesses wider than a single byte to it during an active SPI transfer.
This patch reduces the width of individual DMA read accesses to the RX FIFO
to a single byte to mitigate that issue.