application/demo_eclic_stress: fix INTERRUPT_STACK_SIZE causing RAM overflow

Restore INTERRUPT_STACK_SIZE from 20480 to 10240. The previous value
caused .bss section overflow in linker, which is not related to the
SMODE_STACK_SIZE increase for RVV vector interrupt support

Signed-off-by: Huaqi Fang <578567190@qq.com>

Author: fanghuaqi

application/baremetal/demo_eclic_stress/main.c

@@ -197,7 +197,7 @@
 #define SMODE_TIMER_TICKS       (SOC_TIMER_FREQ / (1000 / (SMODE_TICK_MS)))
 
 /* Create separated interrupt stack M-Mode and S-Mode execution when INTSTACK macro defined */
-#define INTERRUPT_STACK_SIZE        20480
+#define INTERRUPT_STACK_SIZE        10240
 uint8_t mmode_int_stack[INTERRUPT_STACK_SIZE] __attribute__((aligned(16)));
 uintptr_t mmode_int_sp = (uintptr_t)(mmode_int_stack + sizeof(mmode_int_stack));