Fix trailing spaces and missing newlines in all mcu-*.yaml files

Bulk cleanup: remove trailing whitespace and ensure files end with a
newline. Structural issues (indentation, bracket spacing) left for
per-file fixes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

mcu-lvgl-eworkbench.yaml

@@ -29,13 +29,13 @@ i2c:
 psram:
   mode: octal
   speed: 40MHz
-  
+
 spi:
   id: display_qspi
   type: quad
   clk_pin: 47
   data_pins: [21, 48, 40, 39]
-    
+
 color:
   - id: my_red
     red: 100%