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/highbank_defconfig b/configs/highbank_defconfig
index 8a7d0fd..4fc7356 100644
--- a/configs/highbank_defconfig
+++ b/configs/highbank_defconfig
@@ -31,6 +31,7 @@
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_ENV_IS_IN_NVRAM=y
 CONFIG_SCSI_AHCI=y
+CONFIG_SYS_64BIT_LBA=y
 CONFIG_BOOTCOUNT_LIMIT=y
 # CONFIG_MMC is not set
 CONFIG_CALXEDA_XGMAC=y