pwm: microchip-core: Convert SOC_MICROCHIP_POLARFIRE to ARCH_MICROCHIP_POLARFIRE

As part of converting RISC-V SOC_FOO symbols to ARCH_FOO to match the
use of such symbols on other architectures, convert the Microchip FPGA
PWM driver to use the new symbol.
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/Kconfig

@@ -407,7 +407,7 @@ config PWM_MEDIATEK
 
 config PWM_MICROCHIP_CORE
 	tristate "Microchip corePWM PWM support"
-	depends on SOC_MICROCHIP_POLARFIRE || COMPILE_TEST
+	depends on ARCH_MICROCHIP_POLARFIRE || COMPILE_TEST
 	depends on HAS_IOMEM && OF
 	help
 	  PWM driver for Microchip FPGA soft IP core.