riscv, bpf: Remove duplicated bpf_flush_icache()

The bpf_flush_icache() is done by bpf_arch_text_copy() already.
Remove the duplicated one in arch_prepare_bpf_trampoline().

Signed-off-by: Hengqi Chen <[email protected]>

Author: chenhengqi

arch/riscv/net/bpf_jit_comp64.c

@@ -1269,7 +1269,6 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *ro_image,
 		goto out;
 	}
 
-	bpf_flush_icache(ro_image, ro_image_end);
 out:
 	kvfree(image);
 	return ret < 0 ? ret : size;