ipq40xx: add MikroTik hAP ac2 support

This adds support for the MikroTik RouterBOARD RBD52G-5HacD2HnD-TC
(hAP ac²), a  indoor dual band, dual-radio 802.11ac
wireless AP with integrated omnidirectional antennae, USB port and  five
10/100/1000 Mbps Ethernet ports.

See https://mikrotik.com/product/hap_ac2 for more info.

Specifications:
 - SoC: Qualcomm Atheros IPQ4018
 - RAM: 128 MB
 - Storage: 16 MB NOR
 - Wireless:
   · Built-in IPQ4018 (SoC) 802.11b/g/n 2x2:2, 2.5 dBi antennae
   · Built-in IPQ4018 (SoC) 802.11a/n/ac 2x2:2, 2.5 dBi antennae
 - Ethernet: Built-in IPQ4018 (SoC, QCA8075) , 5x 1000/100/10 port,
             passive PoE in
- 1x USB Type A port

Installation:
Boot the initramfs image via TFTP and then flash the sysupgrade
image using "sysupgrade -n"

Signed-off-by: Robert Marko <robimarko@gmail.com>

package/firmware/ipq-wifi/Makefile

@@ -43,6 +43,7 @@ ALLWIFIBOARDS:= \
 	linksys_ea8300 \
 	linksys_mr8300-v0 \
 	luma_wrtq-329acn \
+	mikrotik_hap-ac2 \
 	mobipromo_cm520-79f \
 	nec_wg2600hp3 \
 	plasmacloud_pa1200 \
@@ -126,6 +127,7 @@ $(eval $(call generate-ipq-wifi-package,glinet_gl-s1300,GL.iNet GL-S1300))
 $(eval $(call generate-ipq-wifi-package,linksys_ea8300,Linksys EA8300))
 $(eval $(call generate-ipq-wifi-package,linksys_mr8300-v0,Linksys MR8300))
 $(eval $(call generate-ipq-wifi-package,luma_wrtq-329acn,Luma WRTQ-329ACN))
+$(eval $(call generate-ipq-wifi-package,mikrotik_hap-ac2,Mikrotik hAP ac2))
 $(eval $(call generate-ipq-wifi-package,mobipromo_cm520-79f,MobiPromo CM520-79F))
 $(eval $(call generate-ipq-wifi-package,nec_wg2600hp3,NEC Platforms WG2600HP3))
 $(eval $(call generate-ipq-wifi-package,plasmacloud_pa1200,Plasma Cloud PA1200))