mtd: nand: s3c: Unify the register definition and naming

mtd: nand: s3c: Unify the register definition and naming

Merge struct s3c2410_nand and struct s3c2440_nand into one unified
struct s3c24x0_nand. While at it, fix up and rename the functions
to retrieve the NAND base address and fix up the s3c NAND driver to
reflect this change.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Kyungmin Park <[email protected]>
Cc: Lukasz Majewski <[email protected]>
Cc: Minkyu Kang <[email protected]>
Cc: Scott Wood <[email protected]>
Cc: Vladimir Zapolskiy <[email protected]>