meta-mchp-polarfire-soc: recipes-core: update motd to v2025.07 release

Update the message-of-the-day to display the PolarFire SoC release
version v2025.07.

Signed-off-by: Valentina Fernandez <valentina.fernandezalanis@microchip.com>

Author: vfalanis

meta-mchp-polarfire-soc/meta-mchp-polarfire-soc-bsp/recipes-core/base-files/base-files/motd/motd

@@ -1,4 +1,4 @@
-This is version v2025.03 of the Polarfire SoC Yocto BSP.
+This is version v2025.07 of the Polarfire SoC Yocto BSP.
 
 Updated images and documentation are available at:
         https://github.com/polarfire-soc/