Convert CONFIG_EMIF4 et al to Kconfig

This converts the following to Kconfig:
   CONFIG_EMIF4
   CONFIG_SDRC

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefano Babic <sbabic@denx.de>
diff --git a/configs/am3517_crane_defconfig b/configs/am3517_crane_defconfig
index 42260b1..516ac2d 100644
--- a/configs/am3517_crane_defconfig
+++ b/configs/am3517_crane_defconfig
@@ -4,6 +4,7 @@
 CONFIG_SYS_TEXT_BASE=0x80100000
 # CONFIG_SPL_GPIO_SUPPORT is not set
 CONFIG_TARGET_AM3517_CRANE=y
+CONFIG_EMIF4=y
 CONFIG_BOOTDELAY=10
 CONFIG_SPL=y
 # CONFIG_SPL_EXT_SUPPORT is not set
diff --git a/configs/am3517_evm_defconfig b/configs/am3517_evm_defconfig
index b3e89eb..920c61c 100644
--- a/configs/am3517_evm_defconfig
+++ b/configs/am3517_evm_defconfig
@@ -5,6 +5,7 @@
 CONFIG_TI_COMMON_CMD_OPTIONS=y
 # CONFIG_SPL_GPIO_SUPPORT is not set
 CONFIG_TARGET_AM3517_EVM=y
+CONFIG_EMIF4=y
 CONFIG_BOOTDELAY=10
 CONFIG_VERSION_VARIABLE=y
 CONFIG_SPL=y
diff --git a/configs/cm_t3517_defconfig b/configs/cm_t3517_defconfig
index ba7d813..4df40d6 100644
--- a/configs/cm_t3517_defconfig
+++ b/configs/cm_t3517_defconfig
@@ -3,6 +3,7 @@
 CONFIG_ARCH_OMAP2PLUS=y
 CONFIG_SYS_TEXT_BASE=0x80008000
 CONFIG_TARGET_CM_T3517=y
+CONFIG_EMIF4=y
 CONFIG_BOOTDELAY=3
 # CONFIG_CONSOLE_MUX is not set
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
diff --git a/configs/eco5pk_defconfig b/configs/eco5pk_defconfig
index ed32930..2bf48e0 100644
--- a/configs/eco5pk_defconfig
+++ b/configs/eco5pk_defconfig
@@ -3,6 +3,7 @@
 CONFIG_ARCH_OMAP2PLUS=y
 CONFIG_SYS_TEXT_BASE=0x80008000
 CONFIG_TARGET_ECO5PK=y
+CONFIG_EMIF4=y
 CONFIG_BOOTDELAY=10
 CONFIG_SPL=y
 # CONFIG_SPL_EXT_SUPPORT is not set
diff --git a/configs/mcx_defconfig b/configs/mcx_defconfig
index c36cef8..972cb63 100644
--- a/configs/mcx_defconfig
+++ b/configs/mcx_defconfig
@@ -4,6 +4,7 @@
 CONFIG_SYS_TEXT_BASE=0x80008000
 # CONFIG_SPL_GPIO_SUPPORT is not set
 CONFIG_TARGET_MCX=y
+CONFIG_EMIF4=y
 CONFIG_VIDEO=y
 CONFIG_BOOTDELAY=3
 # CONFIG_CONSOLE_MUX is not set
diff --git a/configs/mt_ventoux_defconfig b/configs/mt_ventoux_defconfig
index 09580e7..316e4f0 100644
--- a/configs/mt_ventoux_defconfig
+++ b/configs/mt_ventoux_defconfig
@@ -3,6 +3,7 @@
 CONFIG_ARCH_OMAP2PLUS=y
 CONFIG_SYS_TEXT_BASE=0x80008000
 CONFIG_TARGET_MT_VENTOUX=y
+CONFIG_EMIF4=y
 CONFIG_VIDEO=y
 CONFIG_BOOTDELAY=10
 # CONFIG_CONSOLE_MUX is not set
diff --git a/configs/twister_defconfig b/configs/twister_defconfig
index 7bbf781..53edadb 100644
--- a/configs/twister_defconfig
+++ b/configs/twister_defconfig
@@ -3,6 +3,7 @@
 CONFIG_ARCH_OMAP2PLUS=y
 CONFIG_SYS_TEXT_BASE=0x80008000
 CONFIG_TARGET_TWISTER=y
+CONFIG_EMIF4=y
 CONFIG_BOOTDELAY=10
 CONFIG_SPL=y
 # CONFIG_SPL_EXT_SUPPORT is not set