Style fix: renaming and include guards.

Fixes file name style and include guard style, before
even more and more files get added.

BUG: 30224839
Change-Id: Ie5ebcf14672c7e9d3faae86b88d4f62b516ae00d
TEST: test program that takes a picture still works.
diff --git a/modules/camera/3_4/Android.mk b/modules/camera/3_4/Android.mk
index ad02c20..e785015 100644
--- a/modules/camera/3_4/Android.mk
+++ b/modules/camera/3_4/Android.mk
@@ -47,13 +47,13 @@
     $(call include-path-for, camera)
 
 LOCAL_SRC_FILES := \
-  Camera.cpp \
-  Stream.cpp \
-  StreamFormat.cpp \
-  V4L2Camera.cpp \
-  V4L2CameraHAL.cpp \
-  V4L2Gralloc.cpp \
-  V4L2Wrapper.cpp \
+  camera.cpp \
+  stream.cpp \
+  stream_format.cpp \
+  v4l2_camera.cpp \
+  v4l2_camera_hal.cpp \
+  v4l2_gralloc.cpp \
+  v4l2_wrapper.cpp \
 
 LOCAL_CFLAGS += -Wall -Wextra -fvisibility=hidden