[bsp][nuvoton] modify RT_WEAK as rt_weak

bsp/nuvoton/libraries/ma35/rtt_port/drv_disp.c

@@ -73,9 +73,9 @@ static struct nu_disp nu_fbdev[eLayer_Cnt] =
 #endif
 };
 
-RT_WEAK void nu_lcd_backlight_on(void) { }
+rt_weak void nu_lcd_backlight_on(void) { }
 
-RT_WEAK void nu_lcd_backlight_off(void) { }
+rt_weak void nu_lcd_backlight_off(void) { }
 
 static void nu_disp_isr(int vector, void *param)
 {

bsp/nuvoton/libraries/ma35/rtt_port/drv_rtp.c

@@ -100,7 +100,7 @@ exit_nu_rtp_load_from_memory:
 }
 #endif
 
-RT_WEAK void nu_rtp_sspcc_setup(void)
+rt_weak void nu_rtp_sspcc_setup(void)
 {
     SSPCC_SET_REALM(SSPCC_UART16, SSPCC_SSET_SUBM);
 

bsp/nuvoton/numaker-hmi-ma35d1/applications/lvgl/lv_demo.c

@@ -10,7 +10,7 @@
 
 #include <lvgl.h>
 
-RT_WEAK void lv_user_gui_init(void)
+rt_weak void lv_user_gui_init(void)
 {
     /* display demo; you may replace with your LVGL application at here and disable related definitions. */