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/textures/decoders.h

@@ -12,8 +12,8 @@ namespace Tegra::Texture {
 
 // GOBSize constant. Calculated by 64 bytes in x multiplied by 8 y coords, represents
 // an small rect of (64/bytes_per_pixel)X8.
-inline std::size_t GetGOBSize() {
-    return 512;
+inline std::size_t GetGOBSizeShift() {
+    return 9;
 }
 
 /// Unswizzles a swizzled texture without changing its format.