mtd: nand: Rename nand.h into rawnand.h

mtd: nand: Rename nand.h into rawnand.h

We are planning to share more code between different NAND based
devices (SPI NAND, OneNAND and raw NANDs), but before doing that
we need to move the existing include/linux/mtd/nand.h file into
include/linux/mtd/rawnand.h so we can later create a nand.h header
containing all common structure and function prototypes.

Signed-off-by: Boris Brezillon <[email protected]>
Signed-off-by: Peter Pan <[email protected]>
Acked-by: Vladimir Zapolskiy <[email protected]>
Acked-by: Alexander Sverdlin <[email protected]>
Acked-by: Wenyou Yang <[email protected]>
Acked-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Han Xu <[email protected]>
Acked-by: H Hartley Sweeten <[email protected]>
Acked-by: Shawn Guo <[email protected]>
Acked-by: Gregory CLEMENT <[email protected]>
Acked-by: Neil Armstrong <[email protected]>
Acked-by: Masahiro Yamada <[email protected]>
Acked-By: Harvey Hunt <[email protected]>
Acked-by: Tony Lindgren <[email protected]>
Acked-by: Krzysztof Halasa <[email protected]>