reset: starfive: Replace SOC_STARFIVE with ARCH_STARFIVE

Using ARCH_FOO symbol is preferred than SOC_FOO.

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Signed-off-by: Hal Feng <hal.feng@starfivetech.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>