spi: spi-qpic-snand: don't hardcode ECC steps

spi: spi-qpic-snand: don't hardcode ECC steps

NAND devices with different page sizes requires different number
of ECC steps, yet the qcom_spi_ecc_init_ctx_pipelined() function
sets 4 steps in 'ecc_cfg' unconditionally.

The correct number of the steps is calculated earlier in the
function already, so use that instead of the hardcoded value.

Fixes: 7304d1909080 ("spi: spi-qpic: add driver for QCOM SPI NAND flash Interface")
Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
Link: https://patch.msgid.link/20250723-qpic-snand-fix-steps-v1-1-d800695dde4c@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>