ArmVirtPkg: handle NETWORK_TLS_ENABLE in ArmVirtQemu*

Port the [LibraryClasses], [PcdsFixedAtBuild] and [Components] settings
that are related to NETWORK_TLS_ENABLE from OvmfPkg to ArmVirtPkg.
ArmVirtXen is not modified because it doesn't include the edk2 network
stack.

(This change is now simpler than it would have been when TianoCore#1009
was originally filed, due to ArmVirtPkg consuming the NetworkPkg include
fragments meanwhile, from TianoCore#1293 / commit 157a3b1aa50f.)

The usage hints from "OvmfPkg/README", section "HTTPS Boot", apply.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Gary Lin <glin@suse.com>
Cc: Guillaume GARDET <guillaume.gardet@arm.com>
Cc: Julien Grall <julien.grall@arm.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1009
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Guillaume Gardet <guillaume.gardet@arm.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Tested-by: Gary Lin <glin@suse.com>

ArmVirtPkg/ArmVirt.dsc.inc

@@ -71,6 +71,9 @@
 
   # Networking Requirements
 !include NetworkPkg/NetworkLibs.dsc.inc
+!if $(NETWORK_TLS_ENABLE) == TRUE
+  TlsLib|CryptoPkg/Library/TlsLib/TlsLib.inf
+!endif
 
 
   #
@@ -136,7 +139,11 @@
   # CryptoPkg libraries needed by multiple firmware features
   #
   IntrinsicLib|CryptoPkg/Library/IntrinsicLib/IntrinsicLib.inf
+!if $(NETWORK_TLS_ENABLE) == TRUE
+  OpensslLib|CryptoPkg/Library/OpensslLib/OpensslLib.inf
+!else
   OpensslLib|CryptoPkg/Library/OpensslLib/OpensslLibCrypto.inf
+!endif
   BaseCryptLib|CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf
 
   #