spi: spi-qpic-snand: reuse qcom_spi_check_raw_flash_errors()

The qcom_spi_check_raw_flash_errors() function can be used to
verify the flash status after raw operations.

Move the function slightly up in the code and change the
qcom_spi_read_last_cw() function to call it instead of using
an open coded implementation of the same check.

Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
Link: https://patch.msgid.link/20250514-qpic-snand-error-check-v1-1-c0ebd3aae72a@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>