MT#63155 efi_support: do not rely on presence of einfo function

The einfo() function is available via /etc/grml/lsb-functions,
which we don't source in our deployment.sh.

Fixes:

  Creating partition table
  /tmp/netscript.grml: line 357: einfo: command not found

Thanks: Volodymyr Fedorov for reporting

Change-Id: Ifc1d06fa8c7f64db502054c501c12e0d8b122dd5

templates/scripts/includes/deployment.sh

@@ -354,7 +354,7 @@ efi_support() {
   modprobe efivarfs &>/dev/null || true
 
   if [ -d /sys/firmware/efi ] ; then
-    einfo "EFI support detected."
+    echo "EFI support detected."
     return 0
   fi