Convert CONFIG_LZMA to Kconfig

This converts the following to Kconfig:
   CONFIG_LZMA

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/zipitz2_defconfig b/configs/zipitz2_defconfig
index 06e915c..0b38f2b 100644
--- a/configs/zipitz2_defconfig
+++ b/configs/zipitz2_defconfig
@@ -19,5 +19,6 @@
 CONFIG_USB=y
 CONFIG_USB_STORAGE=y
 CONFIG_LCD=y
+CONFIG_LZMA=y
 CONFIG_OF_LIBFDT=y
 # CONFIG_EFI_LOADER is not set