sysutils/edk2: fix network boot on bhyve

NetworkPkg's DxeNetLib needs EFI_RNG_PROTOCOL, and the Bhyve build's
only producer is VirtioRngDxe, which never binds since bhyve has no
virtio-rng device. RngDxe uses RDRAND instead and needs no device.
TcpDxe depexes gEfiHash2ServiceBindingProtocolGuid, so add
Hash2DxeCrypto too; without TcpDxe there is no HttpServiceBinding.
Also enable HTTP boot.

PR: 298499
Approved by: manu
Sponsored by: Netflix