video_core: Use un-shifted block sizes to avoid integer divisions

Instead of storing all block width, height and depths in their shifted
form:

block_width = 1U << block_shift;

Store them like they are provided by the emulated hardware (their
block_shift form). This way we can avoid doing the costly
Common::AlignUp operation to align texture sizes and drop CPU integer
divisions with bitwise logic (defined in Common::AlignBits).

src/video_core/engines/maxwell_dma.h

@@ -59,11 +59,11 @@ public:
             };
 
             u32 BlockHeight() const {
-                return 1 << block_height;
+                return block_height;
             }
 
             u32 BlockDepth() const {
-                return 1 << block_depth;
+                return block_depth;
             }
         };