Don't build otatools for PDK

Change-Id: I5e73d103300ac938f80b3ff0af978c123d649fed
diff --git a/core/Makefile b/core/Makefile
index 18135d3..9a48a9d 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1415,6 +1415,9 @@
 ifeq ($(recovery_fstab),)
 build_ota_package := false
 endif
+ifeq ($(TARGET_BUILD_PDK),true)
+build_ota_package := false
+endif
 
 ifeq ($(build_ota_package),true)
 OTATOOLS :=  $(HOST_OUT_EXECUTABLES)/minigzip \