Convert CONFIG_LBA48 et al to Kconfig

This converts the following to Kconfig:
   CONFIG_LBA48
   CONFIG_SYS_64BIT_LBA

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 9c9641d..7715c40 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -116,6 +116,7 @@
 	depends on PPC
 	select AHCI
 	select LIBATA
+	imply LBA48
 	help
 	  Enable this driver to support the SATA controller found in
 	  some Freescale PowerPC SoCs.