[WPA3] Initialize Suite-B ciphers correctly based on the CA cert type

Initialize Suite-B ciphers correctly based on the CA cert type. Read the
cert type from key store, parse it and get the signature algorithm.
Enforce SHA384, and initialize AllowedSuiteBCiphers based on the
certificate type: RSA or ECSDA.

Bug: 128861164
Test: Verify Suite-B initialized correctly with RSA and ECDSA certs.
Test: Associate to SUITE_B_192 AP.
Test: atest WifiNetworkSuggestionTest
Change-Id: Ia9b8460caa586f695ed7aab3507ddeb4ecb8c3f3