Merge tag 'sdmmc-20250812' of https://github.com/philmd/qemu into staging

SD/MMC patches queue

- Return noise (dummy byte) when no SD card connected over SPI

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* tag 'sdmmc-20250812' of https://github.com/philmd/qemu:
  tests/functional: Test SPI-SD adapter without SD card connected
  hw/sd/ssi-sd: Return noise (dummy byte) when no card connected

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>