riscv, bpf: Use STACK_ALIGN macro for size rounding up

Use the macro STACK_ALIGN that is defined in asm/processor.h for stack size
rounding up, just like bpf_jit_comp32.c does.
Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Pu Lehui <pulehui@huawei.com>
Link: https://lore.kernel.org/bpf/20240523031835.3977713-1-xiao.w.wang@intel.com

arch/riscv/net/bpf_jit_comp64.c

@@ -868,7 +868,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	stack_size += 8;
 	sreg_off = stack_size;
 
-	stack_size = round_up(stack_size, 16);
+	stack_size = round_up(stack_size, STACK_ALIGN);
 
 	if (!is_struct_ops) {
 		/* For the trampoline called from function entry,
@@ -1960,7 +1960,7 @@ void bpf_jit_build_prologue(struct rv_jit_context *ctx, bool is_subprog)
 {
 	int i, stack_adjust = 0, store_offset, bpf_stack_adjust;
 
-	bpf_stack_adjust = round_up(ctx->prog->aux->stack_depth, 16);
+	bpf_stack_adjust = round_up(ctx->prog->aux->stack_depth, STACK_ALIGN);
 	if (bpf_stack_adjust)
 		mark_fp(ctx);
 
@@ -1982,7 +1982,7 @@ void bpf_jit_build_prologue(struct rv_jit_context *ctx, bool is_subprog)
 	if (ctx->arena_vm_start)
 		stack_adjust += 8;
 
-	stack_adjust = round_up(stack_adjust, 16);
+	stack_adjust = round_up(stack_adjust, STACK_ALIGN);
 	stack_adjust += bpf_stack_adjust;
 
 	store_offset = stack_adjust - 8;