1x8 neonfma IGEMM microkernel and 1x8 benchmarks.

Add new 1x8 neonfma IGEMM intrinsics microkernel.
Add benchmarks for 1x8 neon and neonfma IGEMM microkernels.
BUG=142398150,140592595
PiperOrigin-RevId: 273849950
diff --git a/src/init.c b/src/init.c
index da4ff1e..8e35d80 100644
--- a/src/init.c
+++ b/src/init.c
@@ -340,8 +340,7 @@
     .gemm = (xnn_gemm_ukernel_function) xnn_f32_gemm_ukernel_4x8__neonfma_ld64,
     .igemm = (xnn_igemm_ukernel_function) xnn_f32_igemm_ukernel_4x8__neonfma_ld64,
     .gemm1 = (xnn_gemm_ukernel_function) xnn_f32_gemm_ukernel_1x8__neonfma_ld64,
-    // TODO(b/140592595): xnn_f32_igemm_ukernel_1x8__neonfma_ld64
-    .igemm1 = (xnn_igemm_ukernel_function) xnn_f32_igemm_ukernel_1x8__aarch64_neonfma_cortex_a75,
+    .igemm1 = (xnn_igemm_ukernel_function) xnn_f32_igemm_ukernel_1x8__neonfma_ld64,
     .mr = 4,
     .nr = 8,
   };