enable rp2040 for online_image (#7769)

tests/components/online_image/common-rp2040.yaml

@@ -0,0 +1,19 @@
+<<: !include common.yaml
+
+spi:
+  - id: spi_main_lcd
+    clk_pin: 18
+    mosi_pin: 19
+    miso_pin: 16
+
+display:
+  - platform: ili9xxx
+    id: main_lcd
+    model: ili9342
+    cs_pin: 20
+    dc_pin: 17
+    reset_pin: 21
+    invert_colors: true
+    lambda: |-
+      it.fill(Color(0, 0, 0));
+      it.image(0, 0, id(online_rgba_image));

tests/components/online_image/test.rp2040-ard.yaml

@@ -0,0 +1,4 @@
+<<: !include common-rp2040.yaml
+
+http_request:
+  verify_ssl: false