Fix for #723 Bugfix/fix spi 4 byte alignment error (GIT8266O-397) (GIT8266O-704)

[vargavik]

Fix for the SPI communication problem described in "Improve SPI interface (GIT8266O-397) #723"

[CLAassistant]

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2 out of 7 committers have signed the CLA.

✅ vargavik
✅ cwespressif
❌ ESP-YJM
❌ donghengqaz
❌ ustccw
❌ projectgus
❌ Zhang Jun Hao

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