arm/dt: zinc: Add kmalloc heap

The kmalloc heap is needed for testing purposes. Add the definition
of the heap in the devicetree.

Change-Id: Ib1372888ee8d7f12589a03c6f962853aa823ad68
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
diff --git a/arch/arm/boot/dts/msmzinc-ion.dtsi b/arch/arm/boot/dts/msmzinc-ion.dtsi
index 4bf078a..aac4230 100644
--- a/arch/arm/boot/dts/msmzinc-ion.dtsi
+++ b/arch/arm/boot/dts/msmzinc-ion.dtsi
@@ -20,6 +20,10 @@
 			reg = <30>;
 		};
 
+		qcom,ion-heap@21 { /* SYSTEM CONTIG HEAP */
+			reg = <21>;
+		};
+
 		qcom,ion-heap@25 { /* IOMMU HEAP */
 			reg = <25>;
 		};