Include libmm-omxcore in mako builds.

It used to be built implicitly as a side-effect of a test
package that used it, and when that test package was removed
libmm-omxcore disappeared as well.

Change-Id: I5ddf4550397288431686ba99d366b74135acbc4b
diff --git a/device.mk b/device.mk
index b4a17a8..dc7cd63 100644
--- a/device.mk
+++ b/device.mk
@@ -202,6 +202,7 @@
 	libmmcamera_interface
 
 PRODUCT_PACKAGES += \
+        libmm-omxcore \
 	libdivxdrmdecrypt \
 	libOmxVdec \
 	libOmxVenc \