mips: mt76xx: Add sysreset support

This patch adds the necessary sysreset DT node and enables the required
drivers via Kconfig.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 10b55c9..071dea0 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -83,6 +83,7 @@
 	select SUPPORTS_CPU_MIPS32_R1
 	select SUPPORTS_CPU_MIPS32_R2
 	select SUPPORTS_LITTLE_ENDIAN
+	select SYSRESET
 
 config MACH_PIC32
 	bool "Support Microchip PIC32"