configs: mtmips: refresh for mt7628 based boards

Since mt7620 is added into Kconfig, the CONFIG_SOC_MT7628=y which is
omitted by default must be added back, otherwise make xxx_defconfig for
these boards will be configured for mt7620 platform.

Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/configs/gardena-smart-gateway-mt7688_defconfig b/configs/gardena-smart-gateway-mt7688_defconfig
index 001a66d..c03123f 100644
--- a/configs/gardena-smart-gateway-mt7688_defconfig
+++ b/configs/gardena-smart-gateway-mt7688_defconfig
@@ -12,6 +12,7 @@
 CONFIG_SYS_BOOTCOUNT_SINGLEWORD=y
 CONFIG_ENV_OFFSET_REDUND=0xB0000
 CONFIG_ARCH_MTMIPS=y
+CONFIG_SOC_MT7628=y
 CONFIG_DEFAULT_DEVICE_TREE="gardena-smart-gateway-mt7688"
 CONFIG_RESTORE_EXCEPTION_VECTOR_BASE=y
 # CONFIG_MIPS_BOOT_ENV_LEGACY is not set
diff --git a/configs/linkit-smart-7688_defconfig b/configs/linkit-smart-7688_defconfig
index 437000b..dd2524e 100644
--- a/configs/linkit-smart-7688_defconfig
+++ b/configs/linkit-smart-7688_defconfig
@@ -9,6 +9,7 @@
 CONFIG_SPL_SYS_MALLOC_F_LEN=0x40000
 CONFIG_SPL=y
 CONFIG_ARCH_MTMIPS=y
+CONFIG_SOC_MT7628=y
 CONFIG_BOARD_LINKIT_SMART_7688=y
 CONFIG_DEFAULT_DEVICE_TREE="linkit-smart-7688"
 CONFIG_RESTORE_EXCEPTION_VECTOR_BASE=y
diff --git a/configs/mt7628_rfb_defconfig b/configs/mt7628_rfb_defconfig
index 6902572..831e54e 100644
--- a/configs/mt7628_rfb_defconfig
+++ b/configs/mt7628_rfb_defconfig
@@ -9,6 +9,7 @@
 CONFIG_SPL_SYS_MALLOC_F_LEN=0x40000
 CONFIG_SPL=y
 CONFIG_ARCH_MTMIPS=y
+CONFIG_SOC_MT7628=y
 CONFIG_BOARD_MT7628_RFB=y
 CONFIG_DEFAULT_DEVICE_TREE="mediatek,mt7628-rfb"
 CONFIG_RESTORE_EXCEPTION_VECTOR_BASE=y
diff --git a/configs/vocore2_defconfig b/configs/vocore2_defconfig
index acb9abf..e255829 100644
--- a/configs/vocore2_defconfig
+++ b/configs/vocore2_defconfig
@@ -10,6 +10,7 @@
 CONFIG_SPL=y
 CONFIG_SYS_BOOTCOUNT_SINGLEWORD=y
 CONFIG_ARCH_MTMIPS=y
+CONFIG_SOC_MT7628=y
 CONFIG_BOARD_VOCORE2=y
 CONFIG_DEFAULT_DEVICE_TREE="vocore_vocore2"
 CONFIG_RESTORE_EXCEPTION_VECTOR_BASE=y