firmware: imx: add SCU firmware driver support
The System Controller Firmware (SCFW) is a low-level system function which runs on a dedicated Cortex-M core to provide power, clock, and resource management. It exists on some i.MX8 processors. e.g. i.MX8QM (QM, QP), and i.MX8QX (QXP, DX). This patch implements the SCU firmware IPC function and the common message sending API sc_call_rpc. Cc: Shawn Guo <shawnguo@kernel.org> Cc: Fabio Estevam <fabio.estevam@nxp.com> Cc: Jassi Brar <jassisinghbrar@gmail.com> Reviewed-by:Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by:
Dong Aisheng <aisheng.dong@nxp.com> Signed-off-by:
Shawn Guo <shawnguo@kernel.org>
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