Fix spiTransaction not updating clock line immediately (#9221)

[and3rson]

Description of Change

This PR fixes #9221 by forcing SPI clock line to update within spiTransaction.
This is especially important when sharing a single SPI bus between devices with different SPI modes.
Notable use case is using SD card (SPI mode 0) and ST7789-based TFT display (mode 3).

Tests scenarios

Tested with ESP32-C3 SuperMini board.

Related links

• SPI.beginTransaction does not set SCK value until the first write #9221
• Arduino_ESP32SPI: startWrite sets CPOL/CPHA too late moononournation/Arduino_GFX#433

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[me-no-dev]

Thanks @and3rson ! This is a nice solution