cmake: Added more x86_64 CPU backends when building with GGML_CPU_ALL_VARIANTS=On (#18186)

* minor: Consolidated `#include <immintrin.h>` under `ggml-cpu-impl.h`

* cmake: Added more x86-64 CPU backends when building with `GGML_CPU_ALL_VARIANTS=On`

- `ivybridge`
- `piledriver`
- `cannonlake`
- `cascadelake`
- `cooperlake`
- `zen4`

Resolves: #17966

ggml/src/ggml-impl.h

@@ -24,10 +24,6 @@
 #include <arm_neon.h>
 #endif
 
-#if defined(__F16C__)
-#include <immintrin.h>
-#endif
-
 #ifdef __cplusplus
 extern "C" {
 #endif