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/coreboot64_defconfig b/configs/coreboot64_defconfig
index 3bd099e..a42fc39 100644
--- a/configs/coreboot64_defconfig
+++ b/configs/coreboot64_defconfig
@@ -58,6 +58,8 @@
 CONFIG_SYS_ATA_REG_OFFSET=0
 CONFIG_SYS_ATA_ALT_OFFSET=0
 CONFIG_ATAPI=y
+CONFIG_LBA48=y
+CONFIG_SYS_64BIT_LBA=y
 # CONFIG_PCI_PNP is not set
 CONFIG_SOUND=y
 CONFIG_SOUND_I8254=y