discover: CPU supports flash attention

We already run flash attention on CPUs in cases where we have
partial offloading but were disabling it if running on pure CPU,
 which is unnecessary.

discover/types.go

@@ -171,7 +171,8 @@ func (si SystemInfo) GetOptimalThreadCount() int {
 // For each GPU, check if it does NOT support flash attention
 func (l GpuInfoList) FlashAttentionSupported() bool {
 	for _, gpu := range l {
-		supportsFA := gpu.Library == "metal" ||
+		supportsFA := gpu.Library == "cpu" ||
+			gpu.Library == "metal" ||
 			(gpu.Library == "cuda" && gpu.DriverMajor >= 7) ||
 			gpu.Library == "rocm"