[common/cpu_detect] Remove SSE/SSE2/FMA4/AVX_VNNI detection (#3979)

Removes Eden's own feature detection for SSE, SSE2, FMA4 and AVX_VNNI, in order to clean up code and make the function slightly lighter. They are all unused and I have specific reasons for their removal:
- SSE/SSE2 are always true for x64
- FMA4 is a deprecated AMD exclusive extension, replaced by the regular FMA and was logged here as "FMA" for no reason
- AVX_VNNI simply does not seem applicable for Eden (but can still be checked for through Xbyak's feature detection if necessary)

Co-authored-by: RedBlackAka <140876408+RedBlackAka@users.noreply.github.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3979
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/qt_common/qt_common.cpp

@@ -223,7 +223,7 @@ void Init(QWidget* root) {
         } else if (caps.avx2) {
             cpu_string += '2';
         }
-        if (caps.fma || caps.fma4) {
+        if (caps.fma) {
             cpu_string += " | FMA";
         }
     }