ramips-mt7621: add support for D-Link COVR X1860 a1 (#3153)

Signed-off-by: Florian Maurer <f.maurer@outlook.de>
(cherry picked from commit 1ba17d6fe2f5bc0f327d42f1627522b709408b67)

docs/user/supported_devices.rst

@@ -417,6 +417,7 @@ ramips-mt7621
 
 * D-Link
 
+  - COVR-X1860 (A1)
   - DAP-X1860 (A1)
   - DIR-860L (B1)
 

targets/ramips-mt7621

@@ -33,6 +33,12 @@ device('cudy-x6-v2', 'cudy_x6-v2', {
 
 -- D-Link
 
+device('d-link-covr-x1860-a1', 'dlink_covr-x1860-a1', {
+	extra_images = {
+		{'-squashfs-recovery', '-recovery', '.bin'}
+	},
+})
+
 device('d-link-dap-x1860-a1', 'dlink_dap-x1860-a1')
 
 device('d-link-dir-860l-b1', 'dlink_dir-860l-b1')