mtd: rawnand: Allocate the interface configurations dynamically

Instead of manipulating the statically allocated structure and copy
timings around, allocate one at identification time and save it in the
nand_chip structure once it has been initialized.

All NAND chips using the same interface configuration during reset and
startup, we define a helper to retrieve a single reset interface
configuration object, shared across all NAND chips.

We use a second pointer to always have a reference on the currently
applied interface configuration, which may either point to the "best
interface configuration" or to the "default reset interface
configuration".

Signed-off-by: Miquel Raynal <[email protected]>
Reviewed-by: Boris Brezillon <[email protected]>
Link: https://lore.kernel.org/linux-mtd/[email protected]

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