With recent firmware updates for older devices (like C120) the embedded
SSL certificate on the deivce is RSA 1024 type, which is considered
insecure nowadays.
0 s:CN=TPRI-DEVICE, O=TPRI, C=US
i:CN=TPRI-DEVICE, O=TPRI, C=US
a:PKEY: RSA, 1024 (bit); sigalg: sha256WithRSAEncryption
v:NotBefore: Jan 1 00:00:00 2001 GMT; NotAfter: Dec 31 23:59:59 2070 GMT
This fix add cipher used by TP-Link to list of allowed ones.
Related: https://github.com/home-assistant/core/issues/162498
Signed-off-by: Alexander D. Kanevskiy <kad@kad.name>