freeradius3: fix recursive dependency from libopenssl-legacy
The 3.2.10 update made freeradius3-common select libopenssl-legacy, which
hard-depends on libopenssl; the generator propagates that onto common's
selectors (freeradius3, freeradius3-utils) as a FREERADIUS3_OPENSSL depends,
looping with the SSL choice. Declare the OpenSSL deps there too to break it.
Fixes: https://github.com/openwrt/packages/pull/30081#issuecomment-5100951400 Signed-off-by: Alexandru Ardelean <redacted>