RISC-V: Fix wrong use of CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK

If configuration options SOFTIRQ_ON_OWN_STACK and PREEMPT_RT
are enabled simultaneously under RISC-V architecture,
it will result in a compilation failure:

arch/riscv/kernel/irq.c:64:6: error: redefinition of 'do_softirq_own_stack'
   64 | void do_softirq_own_stack(void)
      |      ^~~~~~~~~~~~~~~~~~~~
In file included from ./arch/riscv/include/generated/asm/softirq_stack.h:1,
                 from arch/riscv/kernel/irq.c:15:
./include/asm-generic/softirq_stack.h:8:20: note: previous definition of 'do_softirq_own_stack' was here
    8 | static inline void do_softirq_own_stack(void)
      |                    ^~~~~~~~~~~~~~~~~~~~

After changing CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK to CONFIG_SOFTIRQ_ON_OWN_STACK,
compilation can be successful.

Fixes: dd69d07 ("riscv: stack: Support HAVE_SOFTIRQ_ON_OWN_STACK")
Reviewed-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Jiexun Wang <wangjiexun@tinylab.org>

arch/riscv/kernel/irq.c

@@ -60,7 +60,7 @@ static void init_irq_stacks(void)
 }
 #endif /* CONFIG_VMAP_STACK */
 
-#ifdef CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 void do_softirq_own_stack(void)
 {
 #ifdef CONFIG_IRQ_STACKS
@@ -92,7 +92,7 @@ void do_softirq_own_stack(void)
 #endif
 		__do_softirq();
 }
-#endif /* CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK */
+#endif /* CONFIG_SOFTIRQ_ON_OWN_STACK */
 
 #else
 static void init_irq_stacks(void) {}