mips: rename mach-mt7620 to mach-mtmips

Currently mach-mt7620 contains only support for mt7628. To avoid confusion,
rename mach-mt7620 to mach-mtmips, which means MediaTek MIPS platforms.
MT7620 and MT7628 should be distinguished by SOC_MT7620 and SOC_MT7628
because they do not share the same lowlevel codes.

Dependencies of four drivers are changed to SOC_MT7628 as these drivers
are only used by MT7628.

Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

drivers/gpio/Kconfig

@@ -351,7 +351,7 @@ config MPC8XXX_GPIO
 
 config MT7621_GPIO
 	bool "MediaTek MT7621 GPIO driver"
-	depends on DM_GPIO && ARCH_MT7620
+	depends on DM_GPIO && SOC_MT7628
 	default y
 	help
 	  Say yes here to support MediaTek MT7621 compatible GPIOs.

drivers/net/Kconfig

@@ -269,7 +269,7 @@ config MACB_ZYNQ
 
 config MT7628_ETH
 	bool "MediaTek MT7628 Ethernet Interface"
-	depends on ARCH_MT7620
+	depends on SOC_MT7628
 	help
 	  The MediaTek MT7628 ethernet interface is used on MT7628 and
 	  MT7688 based boards.

drivers/spi/Kconfig

@@ -133,7 +133,7 @@ config MPC8XX_SPI
 
 config MT7621_SPI
 	bool "MediaTek MT7621 SPI driver"
-	depends on ARCH_MT7620
+	depends on SOC_MT7628
 	help
 	  Enable the MT7621 SPI driver. This driver can be used to access
 	  the SPI NOR flash on platforms embedding this Ralink / MediaTek

drivers/watchdog/Kconfig

@@ -143,7 +143,7 @@ config WDT_AT91
 
 config WDT_MT7621
 	bool "MediaTek MT7621 watchdog timer support"
-	depends on WDT && ARCH_MT7620
+	depends on WDT && SOC_MT7628
 	help
 	   Select this to enable Ralink / Mediatek watchdog timer,
 	   which can be found on some MediaTek chips.