Add the specific compat string for the smpctrl registers to the SSD201/SSD202D common dtsi. Signed-off-by: Daniel Palmer <daniel@0x0f.com> Link: https://lore.kernel.org/r/20201201134330.3037007-10-daniel@0x0f.com' Signed-off-by: Arnd Bergmann <arnd@arndb.de>