Support the lowlatency-hwe-* when handling kernel flavours.

debian/changelog

@@ -1,3 +1,9 @@
+livecd-rootfs (2.664.15) UNRELEASED; urgency=medium
+
+  * Properly handle lowlatency-hwe-* (LP: #1914217)
+
+ -- Łukasz 'sil2100' Zemczak <lukasz.zemczak@ubuntu.com>  Tue, 02 Feb 2021 11:39:11 +0100
+
 livecd-rootfs (2.664.14) focal; urgency=medium
 
   * Actually also enable the hwe kernel for all flavours for 20.04.2

live-build/auto/build

@@ -826,6 +826,9 @@ for FLAVOUR in $LB_LINUX_FLAVOURS; do
 		virtual|generic-hwe-*)
 			FLAVOUR="generic"
 			;;
+		lowlatency-hwe-*)
+			FLAVOUR="lowlatency"
+			;;
 		oem-*)
 			FLAVOUR="oem"
 			;;