sched/sleep: replace all Signal-based sleep implement to Scheduled sleep

Nuttx currently has 2 types of sleep interfaces:

1. Signal-scheduled sleep: nxsig_sleep() / nxsig_usleep() / nxsig_nanosleep()
Weaknesses:
a. Signal-dependent: The signal-scheduled sleep method is bound to the signal framework, while some driver sleep operations do not depend on signals.
b. Timespec conversion: Signal-scheduled sleep involves timespec conversion, which has a significant impact on performance.

2. Busy sleep: up_mdelay() / up_udelay()
Weaknesses:
a. Does not actively trigger scheduling, occupy the CPU loading.

3. New interfaces: Scheduled sleep: nxsched_sleep() / nxsched_usleep() / nxsched_msleep() / nxsched_ticksleep()
Strengths:
a. Does not depend on the signal framework.
b. Tick-based, without additional computational overhead.

Currently, the Nuttx driver framework extensively uses nxsig_* interfaces. However, the driver does not need to rely on signals or timespec conversion.
Therefore, a new set of APIs is added to reduce dependencies on other modules.

(This PR also aims to make signals optional, further reducing the code size of Nuttx.)

Signed-off-by: chao an <anchao.archer@bytedance.com>

boards/xtensa/esp32s3/esp32s3-box/src/esp32s3_board_lcd_ili9342c.c

@@ -494,11 +494,11 @@ static struct ili9341_lcd_s *esp32s3_initializa_ili9342c(int spi_port)
 
   /* Reset LCD */
 
-  nxsig_usleep(10 * 1000);
+  nxsched_usleep(10 * 1000);
   esp32s3_gpiowrite(DISPLAY_RST, true);
-  nxsig_usleep(10 * 1000);
+  nxsched_usleep(10 * 1000);
   esp32s3_gpiowrite(DISPLAY_RST, false);
-  nxsig_usleep(50 * 1000);
+  nxsched_usleep(50 * 1000);
 
   /* Turn on LCD backlight */
 

boards/xtensa/esp32s3/esp32s3-box/src/esp32s3_board_lcd_st7789.c

@@ -85,9 +85,9 @@ int board_lcd_initialize(void)
   /* Reset LCD */
 
   esp32s3_gpiowrite(DISPLAY_RST, false);
-  nxsig_usleep(10 * 1000);
+  nxsched_usleep(10 * 1000);
   esp32s3_gpiowrite(DISPLAY_RST, true);
-  nxsig_usleep(10 * 1000);
+  nxsched_usleep(10 * 1000);
 
   /* Turn on LCD backlight */
 

boards/xtensa/esp32s3/esp32s3-devkit/src/esp32s3_st7735.c

@@ -87,9 +87,9 @@ int board_lcd_initialize(void)
 
   esp32s3_configgpio(GPIO_LCD_RST, OUTPUT);
   esp32s3_gpiowrite(GPIO_LCD_RST, false);
-  nxsig_usleep(10000);
+  nxsched_usleep(10000);
   esp32s3_gpiowrite(GPIO_LCD_RST, true);
-  nxsig_usleep(100000);
+  nxsched_usleep(100000);
 
   return OK;
 }

boards/xtensa/esp32s3/esp32s3-lcd-ev/src/esp32s3_lcd.c

@@ -631,7 +631,7 @@ static void lcd_configure_display(void)
 
   /* Wait until LCD is ready */
 
-  nxsig_usleep(120 * 1000);
+  nxsched_usleep(120 * 1000);
 
   /* Display on */
 
@@ -639,7 +639,7 @@ static void lcd_configure_display(void)
 
   /* Wait until LCD is on */
 
-  nxsig_usleep(20 * 1000);
+  nxsched_usleep(20 * 1000);
 }
 
 /****************************************************************************