CryptoPkg/TlsLib: replace TlsGetCipherString() with TlsGetCipherMapping()
CryptoPkg/TlsLib: replace TlsGetCipherString() with TlsGetCipherMapping()

In the following patches it will be useful if the IANA CipherId lookup
returns a pointer to the whole matching IANA-to-OpenSSL mapping structure,
not just the OpenSSL cipher suite name. Rename TLS_CIPHER_PAIR and
TlsGetCipherString() to TLS_CIPHER_MAPPING and TlsGetCipherMapping()
respectively, and make the function return a pointer to
TLS_CIPHER_MAPPING.

Cc: Jiaxin Wu <91f509c31e98a6df13950454fe51aea543223eaa@intel.com>
Cc: Qin Long <39a52309c812a080396e90c26873d3f69837761a@intel.com>
Cc: Siyuan Fu <eef549df2036636f79f66102b4e2dc444721df8f@intel.com>
Cc: Ting Ye <fe1f30c12225d8cd094a72a37b5acbb01ee15159@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=915
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <7437296077edea1cb64451c122c4dac071f0cfbc@redhat.com>
Reviewed-by: Long Qin <39a52309c812a080396e90c26873d3f69837761a@intel.com>
Reviewed-by: Jiaxin Wu <91f509c31e98a6df13950454fe51aea543223eaa@intel.com>

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2