Convert CONFIG_LSCHLV2 to Kconfig et al

This converts the following to Kconfig:
   CONFIG_LSCHLV2
   CONFIG_LSXHL

Cc: Michael Walle <michael@walle.cc>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Michael Walle <michael@walle.cc>
diff --git a/configs/lsxhl_defconfig b/configs/lsxhl_defconfig
index 046db90..0de6fc5 100644
--- a/configs/lsxhl_defconfig
+++ b/configs/lsxhl_defconfig
@@ -7,6 +7,7 @@
 CONFIG_SYS_TEXT_BASE=0x600000
 CONFIG_NR_DRAM_BANKS=2
 CONFIG_TARGET_LSXL=y
+CONFIG_LSXHL=y
 CONFIG_ENV_SIZE=0x10000
 CONFIG_ENV_OFFSET=0x70000
 CONFIG_ENV_SECT_SIZE=0x10000
@@ -15,7 +16,6 @@
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_SYS_LOAD_ADDR=0x800000
 CONFIG_API=y
-CONFIG_SYS_EXTRA_OPTIONS="LSXHL"
 CONFIG_SHOW_BOOT_PROGRESS=y
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y