UPSTREAM: mtd: rpc: Add Renesas RPC Hyperflash driver

Add driver for the RPC block in Hyperflash mode. This driver allows
access to a CFI Hyperflash attached to the RPC block and does not
support RP

UPSTREAM: mtd: rpc: Add Renesas RPC Hyperflash driver

Add driver for the RPC block in Hyperflash mode. This driver allows
access to a CFI Hyperflash attached to the RPC block and does not
support RPC in SPI mode.

Change-Id: Ifb30047694ea0ef39f5d7f7b4181cce338a8f245
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 a405a55ba8daf70311a1831938bbdc1ed92c5a83)

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