Allow 64bits bitParameterBlocks

BZ: 59348

bitParameterBlocks are limited to 32 bits, extend it to 64 bits.
This change includes:
- PFW code change
- XML schema update

Change-Id: I9861cea0538a17fcba77fa7d573faae36d8731e0
Signed-off-by: Guillaume Denneulin <guillaume.denneulin@intel.com>
Reviewed-on: http://android.intel.com:8080/68189
Reviewed-by: Gozalvez Herrero, Juan AntonioX <juan.antoniox.gozalvez.herrero@intel.com>
Tested-by: Gozalvez Herrero, Juan AntonioX <juan.antoniox.gozalvez.herrero@intel.com>
diff --git a/parameter/Element.h b/parameter/Element.h
index 75171cc..6e5abc9 100644
--- a/parameter/Element.h
+++ b/parameter/Element.h
@@ -96,6 +96,7 @@
 
     // Conversion utilities
     static string toString(uint32_t uiValue);
+    static string toString(uint64_t uiValue);
     static string toString(int32_t iValue);
     static string toString(double dValue);