drm_hwcomposer: Replace LOG_TAG with drmhwc

It's a pain to use logcat filters for drm_hwcomposer since each file has a different tag necessitating one to specify each tag for the logcat filter or use a regex.

Use one tag for all of drm_hwcomposer to simplify this.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
diff --git a/hwc2_device/hwc2_device.cpp b/hwc2_device/hwc2_device.cpp
index d4ee10d..bd2ada5 100644
--- a/hwc2_device/hwc2_device.cpp
+++ b/hwc2_device/hwc2_device.cpp
@@ -17,7 +17,7 @@
 // NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
 // #define LOG_NDEBUG 0 // Uncomment to see HWC2 API calls in logcat
 
-#define LOG_TAG "hwc2-device"
+#define LOG_TAG "drmhwc"
 
 #include <cinttypes>