dt-bindings: phy: apm,xgene-phy: Remove trailing whitespace

Remove trailing whitespace which hurts my eyes.

Fixes: 65ad0d0 ("dt-bindings: phy: Convert apm,xgene-phy to DT schema")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/5b8e9b4f645bcac9d50059e513abba4db7e1aaea.1750771156.git.geert+renesas@glider.be
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: geertu

Documentation/devicetree/bindings/phy/apm,xgene-phy.yaml

@@ -8,7 +8,7 @@ title: APM X-Gene 15Gbps Multi-purpose PHY
 
 maintainers:
   - Khuong Dinh <khuong@os.amperecomputing.com>
-  
+
 description:
   PHY nodes are defined to describe on-chip 15Gbps Multi-purpose PHY. Each
   PHY (pair of lanes) has its own node.