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>

arch/mips/Kconfig

@@ -97,7 +97,6 @@ config ARCH_MTMIPS
 	select SUPPORTS_CPU_MIPS32_R1
 	select SUPPORTS_CPU_MIPS32_R2
 	select SUPPORTS_LITTLE_ENDIAN
-	select SYSRESET
 	select SUPPORT_SPL
 
 config ARCH_JZ47XX

arch/mips/mach-mtmips/Kconfig

@@ -43,6 +43,7 @@ config SOC_MT7628
 	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