[sparc64] linux-image: Recommend grub-ieee1275 instead of (removed) silo

debian/changelog

@@ -802,6 +802,7 @@ linux (4.19.34-1) UNRELEASED; urgency=medium
   * [armel/marvell] Disable HW_RANDOM as no HWRNG drivers are usable here
   * udeb: Add all HWRNG drivers to kernel-image (see #923675)
   * lockdown: Refer to Debian wiki until manual page exists
+  * [sparc64] linux-image: Recommend grub-ieee1275 instead of (removed) silo
 
   [ YunQiang Su ]
   * [mips*r6] Re-enable CONFIG_JUMP_LABEL, which has been fixed in upstream.

debian/config/sparc64/defines

@@ -9,7 +9,8 @@ image-file: arch/sparc/boot/zImage
 
 [image]
 configs:
-suggests: silo, fdutils
+bootloaders: grub-ieee1275
+suggests: fdutils
 install-stem: vmlinuz
 
 [sparc64_description]