[AMD] Add silu_and_mul, gelu_and_mul, gelu_tanh_and_mul, and gelu_quick kernels for AMD GPUs (#7135)

Co-authored-by: yiakwy-xpu-ml-framework-team <961186938@qq.com>
Co-authored-by: HAI <hixiao@gmail.com>

sgl-kernel/python/sgl_kernel/__init__.py

@@ -31,6 +31,10 @@ from sgl_kernel.elementwise import (
     silu_and_mul,
 )
 from sgl_kernel.fused_moe import fused_marlin_moe
+
+if torch.version.hip is not None:
+    from sgl_kernel.elementwise import gelu_quick
+
 from sgl_kernel.gemm import (
     awq_dequantize,
     bmm_fp8,