Revert "mtd: limit OTP NVMEM cell parse to non-NAND devices"

This reverts commit cce311f8 which is
commit d2d73a6d upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Ic1c16a7dcb92e2754a89c72af4923c412725dceb
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>