RISC-V: enable CONFIG_SYSRESET_SBI by default

System reset via the SRST extension in the SBI should be the default.
The driver checks if the extension is available when probing.
So there is no risk in enabling it.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index a0acffa..03f7fdd 100644
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -113,6 +113,7 @@
 config SYSRESET_SBI
 	bool "Enable support for SBI System Reset"
 	depends on RISCV_SMODE && SBI_V02
+	default y
 	select SYSRESET_CMD_POWEROFF if CMD_POWEROFF
 	help
 	  Enable system reset and poweroff via the SBI system reset extension.