🐛 fix SPI & XIP clock phase offset #336
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This PR fixes the SPI phase offset problem (between SPI clock and SPI data_in/data_out) as described in #335 by @andkae. The XIP module is also affected by this bug and is also fixed by this PR.
ℹ️ This bug is only relevant only when using the SPI/XIP interface at very high clock speeds that are close to the processor's main clock (small clock prescaler or high-speed mode enabled).