For uhttpd-tls, try this:
opkg update
wget http://archive.openwrt.org/chaos_calmer/15.05.1/mvebu/generic/packages/base/libustream-polarssl_2015-07-09-c2d73c22618e8ee444e8d346695eca908ecb72d3_mvebu.ipk -O /tmp/libustream-polarssl.ipk
opkg install /tmp/libustream-polarssl.ipk
and then continue:
opkg install uhttpd-mod-tls
opkg install luci-ssl
Unfortunately I can’t try it, I use TOS4 - another architecture.