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/db-mv784mp-gp_defconfig b/configs/db-mv784mp-gp_defconfig
index 4fe0d3e..49c6168 100644
--- a/configs/db-mv784mp-gp_defconfig
+++ b/configs/db-mv784mp-gp_defconfig
@@ -61,6 +61,7 @@
 CONFIG_SPL_OF_TRANSLATE=y
 CONFIG_SATA_MV=y
 CONFIG_SYS_SATA_MAX_DEVICE=2
+CONFIG_LBA48=y
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MVTWSI=y
 # CONFIG_MMC is not set