spi: mtk_qspi: add qspi driver for MT7629 SoC

This patch adds MT7629 qspi driver for accessing SPI NOR flash.

Signed-off-by: Guochun Mao <guochun.mao@mediatek.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 67b42da..392a925 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -34,6 +34,7 @@
 obj-$(CONFIG_MESON_SPIFC) += meson_spifc.o
 obj-$(CONFIG_MPC8XX_SPI) += mpc8xx_spi.o
 obj-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o
+obj-$(CONFIG_MTK_QSPI) += mtk_qspi.o
 obj-$(CONFIG_MT7621_SPI) += mt7621_spi.o
 obj-$(CONFIG_MVEBU_A3700_SPI) += mvebu_a3700_spi.o
 obj-$(CONFIG_MXC_SPI) += mxc_spi.o