Enable FP16 GEMM/IGEMM To use A75 microkernel on Cortex X1

PiperOrigin-RevId: 378932900
diff --git a/src/init.c b/src/init.c
index d764418..7ed3f4d 100644
--- a/src/init.c
+++ b/src/init.c
@@ -1091,6 +1091,7 @@
             break;
 
           case cpuinfo_uarch_cortex_a75:
+          case cpuinfo_uarch_cortex_x1:
             xnn_params.f16.gemm.minmax.gemm = xnn_init_hmp_gemm_ukernel((xnn_gemm_ukernel_function) xnn_f16_gemm_minmax_ukernel_6x16__aarch64_neonfp16arith_cortex_a75);
             break;