Prior to this commit, when calling:
- spi_timing_enter_mspi_low_speed_mode()
- spi_timing_enter_mspi_high_speed_mode()
psram timing is not tuned. This will lead to a stall during early
startup. This bug is on S3, for 80MHz DDR PSRAM
This commit will add psram timing tuning, in these two functions.
For some of the MSPI high frequency setting (e.g. 80M DDR mode Flash or PSRAM), timing tuning is required.
Certain delays will be added to the MSPI RX direction. When system clock switches down, the delays should be
cleared. When system clock switches up, the delays should be restored.
