spi: mt6779: update spi document

this patch update spi document for MT6779 SOC.

Signed-off-by: Mason Zhang <Mason.Zhang@mediatek.com>
Link: https://lore.kernel.org/r/20210226110109.30500-1-Mason.Zhang@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Mason Zhang 2021-02-26 19:01:10 +08:00 • committed by Mark Brown
commit 260864f797
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