Set framework.advanced.flash_chip on ESP32 devices to save IRAM

Values come from ESPHome's own hint in the log of each online device
("Set flash_chip: ... to save IRAM"). Devices that were off got the value of
an identical board (ESP32-PICO-D4 ATOM/Stamp Pico: gd, JC3248W535: generic,
POW Elite: gd), marked as not read from the device.

mcu-echo.yaml

@@ -28,6 +28,8 @@ esp32:
   variant: esp32
   toolchain: esp-idf
   framework:
+    advanced:
+      flash_chip: gd
     type: esp-idf
 
 packages: