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/qemu_mips64_defconfig b/configs/qemu_mips64_defconfig
index 45513be..6835cf1 100644
--- a/configs/qemu_mips64_defconfig
+++ b/configs/qemu_mips64_defconfig
@@ -15,3 +15,4 @@
 # CONFIG_ISO_PARTITION is not set
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_SYS_NS16550=y
+CONFIG_LZMA=y