pwm: Strengthen dependency for PWM_SIFIVE

Back when the sifive pwm driver was added there was no symbol for sifive
SoCs yet. Today there is ARCH_SIFIVE however. Let PWM_SIFIVE depend on
that to ensure the driver is only build for platforms where there is a
chance that the hardware is available.

Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Uwe Kleine-König <[email protected]>

Author: ukleinek

drivers/pwm/Kconfig

@@ -567,7 +567,7 @@ config PWM_SIFIVE
 	tristate "SiFive PWM support"
 	depends on OF
 	depends on COMMON_CLK && HAS_IOMEM
-	depends on RISCV || COMPILE_TEST
+	depends on ARCH_SIFIVE || COMPILE_TEST
 	help
 	  Generic PWM framework driver for SiFive SoCs.