sata: Move drivers into new drivers/ata directory

At present we have the SATA and PATA drivers mixed up in the drivers/block
directory. It is better to split them out into their own place. Use
drivers/ata which is what Linux does.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/Makefile b/drivers/Makefile
index 058bccb..9bbcc7b 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -45,7 +45,7 @@
 obj-$(CONFIG_SPL_WATCHDOG_SUPPORT) += watchdog/
 obj-$(CONFIG_SPL_USB_HOST_SUPPORT) += usb/host/
 obj-$(CONFIG_OMAP_USB_PHY) += usb/phy/
-obj-$(CONFIG_SPL_SATA_SUPPORT) += block/
+obj-$(CONFIG_SPL_SATA_SUPPORT) += ata/
 obj-$(CONFIG_SPL_USB_HOST_SUPPORT) += block/
 obj-$(CONFIG_SPL_MMC_SUPPORT) += block/
 endif
@@ -66,6 +66,7 @@
 ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
 
 obj-y += adc/
+obj-y += ata/
 obj-$(CONFIG_DM_DEMO) += demo/
 obj-$(CONFIG_BIOSEMU) += bios_emulator/
 obj-y += block/