lib: add gzip lib function callback

Signed-off-by: Lei Wen <leiwen@marvell.com>
diff --git a/lib/Makefile b/lib/Makefile
index c60c380..45798de 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -42,6 +42,7 @@
 COBJS-$(CONFIG_OF_CONTROL) += fdtdec.o
 COBJS-$(CONFIG_TEST_FDTDEC) += fdtdec_test.o
 COBJS-$(CONFIG_GZIP) += gunzip.o
+COBJS-$(CONFIG_GZIP_COMPRESSED) += gzip.o
 COBJS-y += hashtable.o
 COBJS-$(CONFIG_LMB) += lmb.o
 COBJS-y += ldiv.o