mtd: rawnand: qcom: Add NAND controller support for SDX55

SDX55 uses QPIC version 2.0.0 IP for the NAND controller support.
In this version, DEV_CMD_* registers are moved to operational state,
hence CPU access in BAM mode is restricted. So, skip accessing these
registers and also use a different config for reading ONFI parameters.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20201126085705.48399-3-manivannan.sadhasivam@linaro.org