ubuntu-image: fix focal+ pi images for armhf to use pi-armhf model name. (LP: #1876358)

debian/changelog

@@ -2,8 +2,10 @@ livecd-rootfs (2.664ubuntu1) UNRELEASED; urgency=medium
 
   * Bump only the UC20 pc image to 8GB, and keep Pi images as small as possible.
     (LP: #1875430)
+  * ubuntu-image: fix focal+ pi images for armhf to use pi-armhf model name.
+    (LP: #1876358)
 
- -- Dimitri John Ledkov <xnox@ubuntu.com>  Fri, 01 May 2020 19:47:10 +0100
+ -- Dimitri John Ledkov <xnox@ubuntu.com>  Fri, 01 May 2020 19:51:57 +0100
 
 livecd-rootfs (2.664) focal; urgency=medium