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/.clang-format b/.clang-format
index 9082c40..26ce4fe 100644
--- a/.clang-format
+++ b/.clang-format
@@ -1,6 +1,7 @@
 ---
 Language:        Cpp
 BasedOnStyle:  Google
+Standard : C++11
 AllowShortIfStatementsOnASingleLine: false
 AllowShortLoopsOnASingleLine: false
 AllowShortFunctionsOnASingleLine: Inline