soc: nuvoton: Add SoC info driver for WPCM450

Add a SoC information driver for Nuvoton WPCM450 SoCs. It provides
information such as the SoC revision.

Usage example:

# grep . /sys/devices/soc0/*

soc: nuvoton: Add SoC info driver for WPCM450

Add a SoC information driver for Nuvoton WPCM450 SoCs. It provides
information such as the SoC revision.

Usage example:

# grep . /sys/devices/soc0/*
/sys/devices/soc0/family:Nuvoton NPCM
/sys/devices/soc0/revision:A3
/sys/devices/soc0/soc_id:WPCM450

Signed-off-by: Jonathan Neuschäfer <[email protected]>
Reviewed-by: Joel Stanley <[email protected]>
Reviewed-by: Paul Menzel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joel Stanley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>

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