rg_system: Initialize and set high all SPI select lines as early as possible

Retro-Go initializes the SPI SD Card before anything else. If the LCD shares the bus and has a floating CS line, it could interfere with the initialization of the SD Card.

So far it hasn't been a major issue (that I know of), but I can certainly see how it could be.

Solution is to set all CS lines high as early as possible.

See this link shared by mtojek:
https://docs.espressif.com/projects/esp-idf/en/v5.0/esp32s2/api-reference/peripherals/sdspi_share.html

(cherry picked from commit 8565070)

Author: ducalex

components/retro-go/rg_system.c

@@ -359,6 +359,16 @@ static void platform_init(void)
         gpio_reset_pin(GPIO_NUM_14);
         gpio_reset_pin(GPIO_NUM_15);
     #endif
+    // Setup all SPI CS lines here in case we have a shared bus. A floating device could cause
+    // problems during the initialization of the first peripherals...
+    #if defined(RG_SCREEN_HOST) && defined(RG_GPIO_LCD_CS)
+        gpio_set_direction(RG_GPIO_LCD_CS, GPIO_MODE_OUTPUT);
+        gpio_set_level(RG_GPIO_LCD_CS, 1);
+    #endif
+    #if defined(RG_STORAGE_SDSPI_HOST) && defined(RG_GPIO_SDSPI_CS)
+        gpio_set_direction(RG_GPIO_SDSPI_CS, GPIO_MODE_OUTPUT);
+        gpio_set_level(RG_GPIO_SDSPI_CS, 1);
+    #endif
     #ifdef RG_GPIO_LED
         gpio_set_direction(RG_GPIO_LED, GPIO_MODE_OUTPUT);
         gpio_set_level(RG_GPIO_LED, 0);