Enable creation of float16 allocations

http://b/24862914

This was previously disabled due to a missing enum value.

Change-Id: I7fc3b3154957199526d74562b11f3d446cbf1328
diff --git a/driver/runtime/rs_allocation.c b/driver/runtime/rs_allocation.c
index 36f100e..415caeb 100644
--- a/driver/runtime/rs_allocation.c
+++ b/driver/runtime/rs_allocation.c
@@ -510,8 +510,7 @@
 
     switch (data_type) {
         case RS_TYPE_BOOLEAN:
-        // Bug: 24862914: Add RS_TYPE_FLOAT_16 once the bug is fixed
-        // case RS_TYPE_FLOAT_16:
+        case RS_TYPE_FLOAT_16:
         case RS_TYPE_FLOAT_32:
         case RS_TYPE_FLOAT_64:
         case RS_TYPE_SIGNED_8:
@@ -544,8 +543,7 @@
     }
     switch (data_type) {
         case RS_TYPE_BOOLEAN:
-        // Bug: 24862914: Add RS_TYPE_FLOAT_16 once the bug is fixed
-        // case RS_TYPE_FLOAT_16:
+        case RS_TYPE_FLOAT_16:
         case RS_TYPE_FLOAT_32:
         case RS_TYPE_FLOAT_64:
         case RS_TYPE_SIGNED_8: