ata: Migrate CONFIG_SCSI_AHCI to Kconfig

And use 'imply' liberally.

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e50ba93..7390995 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -850,6 +850,7 @@
 	select SUPPORT_SPL
 	select ARCH_MISC_INIT
 	imply SCSI
+	imply SCSI_AHCI
 	help
 	  Support for Freescale LS2080AQDS platform
 	  The LS2080A Development System (QDS) is a high-performance
@@ -865,6 +866,7 @@
 	select SUPPORT_SPL
 	select ARCH_MISC_INIT
 	imply SCSI
+	imply SCSI_AHCI
 	help
 	  Support for Freescale LS2080ARDB platform.
 	  The LS2080A Reference design board (RDB) is a high-performance
@@ -926,6 +928,7 @@
 	select ARM64
 	select BOARD_LATE_INIT
 	imply SCSI
+	imply SCSI_AHCI
 	help
 	  Support for Freescale LS1012ARDB platform.
 	  The LS1012A Reference design board (RDB) is a high-performance
diff --git a/arch/arm/cpu/armv7/ls102xa/Kconfig b/arch/arm/cpu/armv7/ls102xa/Kconfig
index 20e2b1a..635358e 100644
--- a/arch/arm/cpu/armv7/ls102xa/Kconfig
+++ b/arch/arm/cpu/armv7/ls102xa/Kconfig
@@ -20,6 +20,7 @@
 	select SYS_FSL_SEC_COMPAT_5
 	select SYS_FSL_SEC_LE
 	imply SCSI
+	imply SCSI_AHCI
 	imply CMD_PCI
 
 menu "LS102xA architecture"
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
index 5a75920..66bc32c 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
+++ b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
@@ -35,6 +35,7 @@
 	select ARCH_EARLY_INIT_R
 	select BOARD_EARLY_INIT_F
 	imply SCSI
+	imply SCSI_AHCI
 	imply CMD_PCI
 
 config ARCH_LS1046A
@@ -61,6 +62,7 @@
 	select ARCH_EARLY_INIT_R
 	select BOARD_EARLY_INIT_F
 	imply SCSI
+	imply SCSI_AHCI
 
 config ARCH_LS1088A
 	bool
diff --git a/arch/arm/include/asm/arch-ls102xa/config.h b/arch/arm/include/asm/arch-ls102xa/config.h
index ff0fc47..2fbd4ef 100644
--- a/arch/arm/include/asm/arch-ls102xa/config.h
+++ b/arch/arm/include/asm/arch-ls102xa/config.h
@@ -81,7 +81,6 @@
 /* SATA */
 #define AHCI_BASE_ADDR				(CONFIG_SYS_IMMR + 0x02200000)
 #define CONFIG_LIBATA
-#define CONFIG_SCSI_AHCI
 #define CONFIG_SCSI_AHCI_PLAT
 #define CONFIG_SYS_SCSI_MAX_SCSI_ID		1
 #define CONFIG_SYS_SCSI_MAX_LUN		1