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

NAND controller support on SDX55 is provided using QPIC v2 controller.
In this version, DEV_CMD_* registers are moved to operational state,
hence CPU access in BAM mode is restricted. Hence, skip accessing these
registers and also use a different config for reading ONFI parameters.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>