Miscellaneous fixes and clean-ups

Merge series from Santhosh Kumar K <s-k6@ti.com>:

This series introduces some small but important fixes and cleanups in
the Cadence QSPI Controller.

Tested on TI's AM62A SK and AM62P SK:
Logs: https://gist.github.com/santhosh21/0d25767b58d9a1d9624f2c502dd8f36b