Enable support for SCMI Raw transmission mode

configname: CONFIG_ARM_SCMI_RAW_MODE_SUPPORT

Linux Kernel Configuration
└─>Device Drivers
└─>Firmware Drivers
└─>ARM System Control and Management Interface Protocol
└─>Enable support for SCMI Raw transmission mode
In linux kernel since version 6.3 (release Date: 2023-04-23)  
Enable support for SCMI Raw transmission mode.

If enabled allows the direct injection and snooping of SCMI bare
messages through a dedicated debugfs interface.
It is meant to be used by SCMI compliance/testing suites.

When enabled regular SCMI drivers interactions are inhibited in
order to avoid unexpected interactions with the SCMI Raw message
flow. If unsure say N.