spi: spi-qpic-snand: make qcom_spi_ecc_engine_ops_pipelined const

Marking the qcom_spi_ecc_engine_ops_pipelined as const provides
memory protection by preventing accidental modification of critical
function pointers at runtime. It also enables memory optimization
by placing the structure in read-only sections and improves code safety
by explicitly documenting the design intent that these operations
should not change after initialization.

Signed-off-by: Can Peng <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-qpic-snand.c

···
 		return snandc->qspi->ecc_stats.bitflips;
 }
 
-static struct nand_ecc_engine_ops qcom_spi_ecc_engine_ops_pipelined = {
+static const struct nand_ecc_engine_ops qcom_spi_ecc_engine_ops_pipelined = {
 	.init_ctx = qcom_spi_ecc_init_ctx_pipelined,
 	.cleanup_ctx = qcom_spi_ecc_cleanup_ctx_pipelined,
 	.prepare_io_req = qcom_spi_ecc_prepare_io_req_pipelined,