gralloc: Add allocator and mapper HALs

Implement the hidl .hal interfaces directly instead of using the
default shims.
This is required since new additions to .hal will no longer be
added to the legacy gralloc1 C header.

Change-Id: If577a14f75d7d13da0ff656c96ab451d21c910ce
diff --git a/gralloc/gr_ion_alloc.h b/gralloc/gr_ion_alloc.h
index b41f5f1..763ac54 100644
--- a/gralloc/gr_ion_alloc.h
+++ b/gralloc/gr_ion_alloc.h
@@ -34,7 +34,7 @@
 
 #define FD_INIT -1
 
-namespace gralloc1 {
+namespace gralloc {
 
 enum {
   CACHE_CLEAN = 0x1,
@@ -81,6 +81,6 @@
   int ion_dev_fd_;
 };
 
-}  // namespace gralloc1
+}  // namespace gralloc
 
 #endif  // __GR_ION_ALLOC_H__