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/configs/ib62x0_defconfig b/configs/ib62x0_defconfig
index 3d4bd51..4771e72 100644
--- a/configs/ib62x0_defconfig
+++ b/configs/ib62x0_defconfig
@@ -53,6 +53,7 @@
 CONFIG_SYS_ATA_ALT_OFFSET=0x100
 CONFIG_SYS_ATA_IDE0_OFFSET=0x2000
 CONFIG_SYS_ATA_IDE1_OFFSET=0x4000
+CONFIG_LBA48=y
 # CONFIG_MMC is not set
 CONFIG_MTD=y
 CONFIG_MTD_RAW_NAND=y