profiles: use the tiny-profile for 32MB-Ram devices

There have been problems seen with devices which only have 32MB RAM. For
such devices there is also the "4/32 depracation warning" from OpenWrt [1]

1 - https://openwrt.org/supported_devices/432_warning

profiles/ar71xx-generic.profiles

@@ -21,26 +21,26 @@ tl-wdr4300-v1
 tl-wdr4310-v1
 tl-wr710n-v1
 tl-wr710n-v2.1
-tl-wr842n-v1
-tl-wr842n-v2
+tl-wr842n-v1:tiny
+tl-wr842n-v2:tiny
 tl-wr842n-v3
-tl-wr1043nd-v1
+tl-wr1043nd-v1:tiny
 tl-wr1043nd-v2
 tl-wr1043nd-v3
 tl-wr1043nd-v4
 tl-wr1043n-v5
 ubnt-air-gateway
 ubnt-air-gateway-pro
 ubnt-airrouter
-ubnt-bullet-m
+ubnt-bullet-m:tiny
 ubnt-lbe-m5
 ubnt-ls-sr71
-ubnt-loco-m-xw
-ubnt-nano-m-xw
-ubnt-nano-m
-ubnt-rocket-m-ti
-ubnt-rocket-m-xw
-ubnt-rocket-m
+ubnt-loco-m-xw:tiny
+ubnt-nano-m-xw:tiny
+ubnt-nano-m:tiny
+ubnt-rocket-m-ti:tiny
+ubnt-rocket-m-xw:tiny
+ubnt-rocket-m:tiny
 ubnt-rs
 ubnt-rspro
 ubnt-unifi