spi: cadence-qspi: put runtime in runtime PM hooks names

spi: cadence-qspi: put runtime in runtime PM hooks names

Follow kernel naming convention with regards to power-management
callback function names.

The convention in the kernel is:
 - prefix_suspend means the system-wide suspend callback;
 - prefix_runtime_suspend means the runtime PM suspend callback.
The same applies to resume callbacks.

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Link: https://msgid.link/r/20240222-cdns-qspi-pm-fix-v4-3-6b6af8bcbf59@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>