ata: Migrate CONFIG_SCSI_AHCI to Kconfig

And use 'imply' liberally.

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
diff --git a/configs/ls1088ardb_qspi_SECURE_BOOT_defconfig b/configs/ls1088ardb_qspi_SECURE_BOOT_defconfig
index e800966..d020f7e 100644
--- a/configs/ls1088ardb_qspi_SECURE_BOOT_defconfig
+++ b/configs/ls1088ardb_qspi_SECURE_BOOT_defconfig
@@ -10,6 +10,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="fsl-ls1088a-rdb"
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_DM=y
+CONFIG_SCSI_AHCI=y
 CONFIG_DM_PCI=y
 CONFIG_DM_PCI_COMPAT=y
 CONFIG_DM_SPI=y