drm_hwcomposer: clang-tidy: enable cppcoreguidelines-* checks

Our code isn't ready for the following checks therefore keep disabled
-cppcoreguidelines-pro-bounds-array-to-pointer-decay
-cppcoreguidelines-pro-bounds-constant-array-index
-cppcoreguidelines-pro-bounds-pointer-arithmetic
-cppcoreguidelines-pro-type-cstyle-cast
-cppcoreguidelines-pro-type-vararg
-cppcoreguidelines-avoid-magic-numbers
-cppcoreguidelines-macro-usage
-cppcoreguidelines-avoid-c-arrays

+ fixed existing tidy warnings for these checks.

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
diff --git a/drm/DrmConnector.h b/drm/DrmConnector.h
index 8533af8..3bc18c8 100644
--- a/drm/DrmConnector.h
+++ b/drm/DrmConnector.h
@@ -111,7 +111,7 @@
 
   std::vector<DrmEncoder *> possible_encoders_;
 
-  uint32_t preferred_mode_id_;
+  uint32_t preferred_mode_id_{};
 };
 }  // namespace android