[Keyboard] Fix compilation size issues for Canary 60 RGB (#15016)

keyboards/canary/canary60rgb/v1/rules.mk

@@ -21,3 +21,5 @@ RGBLIGHT_ENABLE = yes          # Enable keyboard RGB underglow
 AUDIO_ENABLE = no              # Audio output
 RGB_MATRIX_ENABLE = yes        # Use RGB matrix
 RGB_MATRIX_DRIVER = IS31FL3733
+
+LTO_ENABLE = yes