arm: dts: enable MTK SPI NOR controller driver

1. Enable MTK SPI NOR controller driver on mt7622 & mt7629.
2. Enable quad mode for read and single mode for write.

diff --git a/configs/mt7622_rfb_defconfig b/configs/mt7622_rfb_defconfig
index ccf926e..347f5f6 100644
--- a/configs/mt7622_rfb_defconfig
+++ b/configs/mt7622_rfb_defconfig
@@ -49,7 +49,8 @@
 CONFIG_MTK_SERIAL=y
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
-CONFIG_MTK_SNFI_SPI=y
+# CONFIG_MTK_SNFI_SPI is not set
+CONFIG_MTK_SNOR=y
 CONFIG_SYSRESET_WATCHDOG=y
 CONFIG_TIMER=y
 CONFIG_MTK_TIMER=y