mtd: nand: Rename nand_get_flash_type() into nand_detect()

Upstream linux commit 7bb427990ee364.

Rename the function to match this new behavior.

NOTE: fix nand_detect/nand_get_flash_type parameters in
mxs_nand_spl. This code seems never executed by any board
as alternative for nand detect

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Reviewed-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>