drivers: spi: psoc6: Fix spi_psoc6_transceive calls

The commit 4c204036 updated the
`spi_psoc6_transceive` function signature but forgot to update its
usages.

This commit updates the `spi_psoc6_transceive` function invocations
to properly provide the callback and user data parameters.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>