stv0991: enable cadence qspi controller & spi flash

This patch does all the board configurations required to use the qspi
controller & attached spi flash memory.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
Reviewed-by: Jagannadh Teki <jteki@openedev.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 192d9cf..0d2a808 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -227,6 +227,9 @@
 	select CPU_V7
 	select DM
 	select DM_SERIAL
+	select DM_SPI
+	select DM_SPI_FLASH
+	select SPI_FLASH
 
 config TARGET_X600
 	bool "Support x600"