UPSTREAM: mtd: spi: Add Renesas RPC SPI-flash driver

Add driver for the RPC block in SPI-flash mode. This driver allows
access to a SPI NOR flash attached to the RPC block and does not
support RPC i

UPSTREAM: mtd: spi: Add Renesas RPC SPI-flash driver

Add driver for the RPC block in SPI-flash mode. This driver allows
access to a SPI NOR flash attached to the RPC block and does not
support RPC in Hyperflash mode. Note that this block is extremely
selective when communicating with the SPI NOR.

Change-Id: I8b936d2862a1ef4bc2451d54a1808b7b49710b17
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit fbebea27e16eb760f1f2109a7535003bf359ba2b)

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