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/lsxhl_defconfig b/configs/lsxhl_defconfig
index e57f93e..d847255 100644
--- a/configs/lsxhl_defconfig
+++ b/configs/lsxhl_defconfig
@@ -45,6 +45,8 @@
 CONFIG_DM=y
 CONFIG_SATA_MV=y
 CONFIG_SYS_SATA_MAX_DEVICE=1
+CONFIG_LBA48=y
+CONFIG_SYS_64BIT_LBA=y
 CONFIG_KIRKWOOD_GPIO=y
 # CONFIG_MMC is not set
 CONFIG_MTD=y