[BSP/rockchip/rk3568] fixup heapmem init flow

In RT-Smart, `rt_hw_interrupt_init` will call
`rt_ioremap` to map GIC's MMIO registers. There
is a `rt_malloc` called in rt_ioremap, that will
fail if we not init the mem heap yet.

Signed-off-by: GuEe-GUI <GuEe-GUI@github.com>

bsp/rockchip/rk3568/driver/board.c

@@ -62,6 +62,10 @@ void rt_hw_board_init(void)
 
     rt_hw_mmu_setup(&rt_kernel_space, platform_mem_desc, platform_mem_desc_size);
 
+#ifdef RT_USING_HEAP
+    /* initialize memory system */
+    rt_system_heap_init(RT_HW_HEAP_BEGIN, RT_HW_HEAP_END);
+#endif
     /* initialize hardware interrupt */
     rt_hw_interrupt_init();
 
@@ -84,7 +88,6 @@ void rt_hw_board_init(void)
 #ifdef RT_USING_HEAP
     /* initialize memory system */
     rt_kprintf("heap: [0x%08x - 0x%08x]\n", RT_HW_HEAP_BEGIN, RT_HW_HEAP_END);
-    rt_system_heap_init(RT_HW_HEAP_BEGIN, RT_HW_HEAP_END);
 #endif
 
 #ifdef RT_USING_COMPONENTS_INIT