Remove freeze(), unfreeze() and setFreezeTint().

This is all dead code.

Change-Id: I646673aac793a6ec45021c370a2450f0ea4fbcce
diff --git a/include/private/gui/LayerState.h b/include/private/gui/LayerState.h
index 9151c11..239dd87 100644
--- a/include/private/gui/LayerState.h
+++ b/include/private/gui/LayerState.h
@@ -36,7 +36,7 @@
     layer_state_t()
         :   surface(0), what(0),
             x(0), y(0), z(0), w(0), h(0),
-            alpha(0), tint(0), flags(0), mask(0),
+            alpha(0), flags(0), mask(0),
             reserved(0)
     {
         matrix.dsdx = matrix.dtdy = 1.0f;
@@ -61,7 +61,6 @@
             uint32_t        w;
             uint32_t        h;
             float           alpha;
-            uint32_t        tint;
             uint8_t         flags;
             uint8_t         mask;
             uint8_t         reserved;