spi: Add support SH Quad SPI driver

This patch adds a driver for Renesas SoC's Quad SPI bus.
This supports with 8 bits per transfer to use with SPI flash.

Signed-off-by: Kouei Abe <kouei.abe.cp@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index ed4ecd7..d5a7143 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -30,6 +30,7 @@
 obj-$(CONFIG_SANDBOX_SPI) += sandbox_spi.o
 obj-$(CONFIG_SOFT_SPI) += soft_spi.o
 obj-$(CONFIG_SH_SPI) += sh_spi.o
+obj-$(CONFIG_SH_QSPI) += sh_qspi.o
 obj-$(CONFIG_FSL_ESPI) += fsl_espi.o
 obj-$(CONFIG_FDT_SPI) += fdt_spi.o
 obj-$(CONFIG_TEGRA20_SFLASH) += tegra20_sflash.o