spi: Migrate CONFIG_MXS_SPI to Kconfig

Signed-off-by: Tuomas Tynkkynen <tuomas@tuxera.com>
diff --git a/configs/bg0900_defconfig b/configs/bg0900_defconfig
index e097f1c..20c8feb 100644
--- a/configs/bg0900_defconfig
+++ b/configs/bg0900_defconfig
@@ -32,4 +32,5 @@
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_BAR=y
 CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_MXS_SPI=y
 CONFIG_OF_LIBFDT=y
diff --git a/configs/m28evk_defconfig b/configs/m28evk_defconfig
index be0c681..373519d 100644
--- a/configs/m28evk_defconfig
+++ b/configs/m28evk_defconfig
@@ -46,6 +46,7 @@
 CONFIG_NAND_MXS=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_MXS_SPI=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_STORAGE=y
diff --git a/configs/mx28evk_auart_console_defconfig b/configs/mx28evk_auart_console_defconfig
index a3590bb..e9f6ff4 100644
--- a/configs/mx28evk_auart_console_defconfig
+++ b/configs/mx28evk_auart_console_defconfig
@@ -41,6 +41,7 @@
 CONFIG_NAND_MXS=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_SST=y
+CONFIG_MXS_SPI=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_STORAGE=y
diff --git a/configs/mx28evk_defconfig b/configs/mx28evk_defconfig
index 5d661ee..b57bee6 100644
--- a/configs/mx28evk_defconfig
+++ b/configs/mx28evk_defconfig
@@ -41,6 +41,7 @@
 CONFIG_NAND_MXS=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_SST=y
+CONFIG_MXS_SPI=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_STORAGE=y
diff --git a/configs/mx28evk_nand_defconfig b/configs/mx28evk_nand_defconfig
index 3b9962f..8d8bafa 100644
--- a/configs/mx28evk_nand_defconfig
+++ b/configs/mx28evk_nand_defconfig
@@ -40,6 +40,7 @@
 CONFIG_NAND_MXS=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_SST=y
+CONFIG_MXS_SPI=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_STORAGE=y
diff --git a/configs/mx28evk_spi_defconfig b/configs/mx28evk_spi_defconfig
index fee7f21..8959035 100644
--- a/configs/mx28evk_spi_defconfig
+++ b/configs/mx28evk_spi_defconfig
@@ -40,6 +40,7 @@
 CONFIG_NAND_MXS=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_SST=y
+CONFIG_MXS_SPI=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_STORAGE=y