spi: Drop obsolete mtk_qspi driver references

Since u-boot has added the spi-mem framework and replaced
the spi-nor framework, the mtk_qspi is no longer compatible
with the new spi-nor driver.

Remove this driver along with replacing config item
with new mtk spi-nor driver.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
[jagan: squash related changes and update commit message]
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/configs/mt7629_rfb_defconfig b/configs/mt7629_rfb_defconfig
index 0dceafd..d8efba6 100644
--- a/configs/mt7629_rfb_defconfig
+++ b/configs/mt7629_rfb_defconfig
@@ -63,7 +63,7 @@
 CONFIG_MTK_SERIAL=y
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
-CONFIG_MTK_QSPI=y
+CONFIG_MTK_SNFI_SPI=y
 CONFIG_SYSRESET=y
 CONFIG_SPL_SYSRESET=y
 CONFIG_SYSRESET_WATCHDOG=y