NetworkPkg: Do not enforce secure RNG

Since edk2-stable202405 we require EFI_RNG_PROTOCOL for
various network stack drivers.

We can't avoid requiring the protocol, but we do not want to
insist that a secure algorithm is present. If we do leave the Pcd
TRUE, DxeNetLib logs at ERROR when using OVMF
`-device virtio-rng-pci`, and may do so with the available
Rng in various firmware too.

NetworkPkg/NetworkPkg.dec

@@ -135,7 +135,7 @@
   # TRUE  - Enforce the use of Secure UEFI spec defined RNG algorithms.
   # FALSE - Do not enforce and depend on the default implementation of RNG algorithm from the provider.
   # @Prompt Enforce the use of Secure UEFI spec defined RNG algorithms.
-  gEfiNetworkPkgTokenSpaceGuid.PcdEnforceSecureRngAlgorithms|TRUE|BOOLEAN|0x1000000D
+  gEfiNetworkPkgTokenSpaceGuid.PcdEnforceSecureRngAlgorithms|FALSE|BOOLEAN|0x1000000D
 
 [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
   ## IPv6 DHCP Unique Identifier (DUID) Type configuration (From RFCs 3315 and 6355).