keymaster: rename ion_allocation_data.heap_mask to heap_id_mask

Rename the heap_mask field in ion_allocation_data struct to heap_id_mask and
match the new kernel header.

Change-Id: Id149868c13b19023f1d35dabd4222f0342d2c44f
diff --git a/keymaster_qcom.cpp b/keymaster_qcom.cpp
index 629ba82..824920d 100644
--- a/keymaster_qcom.cpp
+++ b/keymaster_qcom.cpp
@@ -224,7 +224,7 @@
     ion_alloc_data.align = 4096;
 
     /* memory is allocated from EBI heap */
-   ion_alloc_data.heap_mask= ION_HEAP(ION_QSECOM_HEAP_ID);
+   ion_alloc_data.heap_id_mask= ION_HEAP(ION_QSECOM_HEAP_ID);
 
     /* Set the memory to be uncached */
     ion_alloc_data.flags = 0;