Merge branch 'bugfix/improve_spi_timing_for_flash_v3.3' into 'release/v3.3'

bugfix(flash): improve spi cs timing settings for flash (backport v3.3)

See merge request espressif/esp-idf!5514

components/bootloader_support/src/bootloader_init.c

@@ -397,6 +397,9 @@ static void IRAM_ATTR flash_gpio_configure(const esp_image_header_t* pfhdr)
             #endif
         }
     }
+
+    // improve the flash cs timing.
+    bootloader_common_set_flash_cs_timing();
 }
 
 static void uart_console_configure(void)