mips: mtmips: select SYSRESET for mt7628 only

Currently only mt7628 needs the sysreset driver, do not select it for
mt7620.

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
diff --git a/arch/mips/mach-mtmips/Kconfig b/arch/mips/mach-mtmips/Kconfig
index 7c07430..c383e82 100644
--- a/arch/mips/mach-mtmips/Kconfig
+++ b/arch/mips/mach-mtmips/Kconfig
@@ -43,6 +43,7 @@
 	select SYS_MIPS_CACHE_INIT_RAM_LOAD
 	select PINCTRL_MT7628
 	select MTK_SERIAL
+	select SYSRESET
 	select SYSRESET_RESETCTL
 	select SPL_SEPARATE_BSS if SPL
 	select SPL_INIT_STACK_WITHOUT_MALLOC_F if SPL