panel-sitronix-st7701: Fix panel prepare over SPI
A DSI write is issued in st7701_prepare even when the probed panel
runs on SPI. In practice, this results in a panic with the
vc4-kms-dpi-hyperpixel2r overlay active.
Perform the equivalent write over SPI in this case.
Signed-off-by: Jack Andersen <jackoalan@gmail.com>
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