ArmPkg/PlatformBootManagerLib: add missing newline

Add a missing newline to the version string output that is displayed
on the serial console, or the next line will be appended to it.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPkg/Library/PlatformBootManagerLib/PlatformBm.c

@@ -549,7 +549,7 @@ PlatformBootManagerAfterConsole (
   Status = BootLogoEnableLogo ();
   if (EFI_ERROR (Status)) {
     if (FirmwareVerLength > 0) {
-      Print (VERSION_STRING_PREFIX L"%s",
+      Print (VERSION_STRING_PREFIX L"%s\n",
         PcdGetPtr (PcdFirmwareVersionString));
     }
     Print (L"Press ESCAPE for boot options ");