UPSTREAM: mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver

The driver adds the support for the STMicroelectronics FMC2 NAND
Controller found on STM32MP SOCs.

This patch adds th

UPSTREAM: mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver

The driver adds the support for the STMicroelectronics FMC2 NAND
Controller found on STM32MP SOCs.

This patch adds the polling mode, a basic mode that do not need
any DMA channels.

Only NAND_ECC_HW mode is actually supported.
The driver supports a maximum 8k page size.
The following ECC strength and step size are currently supported:
- nand-ecc-strength = <8>, nand-ecc-step-size = <512> (BCH8)
- nand-ecc-strength = <4>, nand-ecc-step-size = <512> (BCH4)
- nand-ecc-strength = <1>, nand-ecc-step-size = <512> (Extended ECC
based on Hamming)

This patch has been tested on Micron MT29F8G08ABACAH4.

Change-Id: I30c2a61a49af2f8855f7f98ef302a70554d87a5d
Signed-off-by: Christophe Kerello <christophe.kerello@st.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit 7bb75023a720432a32840c6df543aae92653b23d)

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