nvmem: Create a header for internal sharing

nvmem: Create a header for internal sharing

[ Upstream commit ec9c08a1cb8dc5e8e003f95f5f62de41dde235bb ]

Before adding all the NVMEM layout bus infrastructure to the core, let's
move the main nvmem_device structure in an internal header, only
available to the core. This way all the additional code can be added in
a dedicated file in order to keep the current core file tidy.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20231215111536.316972-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 391b06ecb63e ("nvmem: imx-ocotp-ele: fix MAC address byte order")
Signed-off-by: Sasha Levin <sashal@kernel.org>