x86/64: add more hardware RNG drivers, including for virtio

Signed-off-by: Felix Fietkau <[email protected]>

target/linux/x86/64/config-default

@@ -111,8 +111,9 @@ CONFIG_HPET=y
 CONFIG_HPET_MMAP=y
 # CONFIG_HP_ACCEL is not set
 CONFIG_HVC_DRIVER=y
+CONFIG_HW_RANDOM_AMD=y
 CONFIG_HW_RANDOM_INTEL=y
-# CONFIG_HW_RANDOM_VIRTIO is not set
+CONFIG_HW_RANDOM_VIRTIO=y
 CONFIG_HYPERVISOR_GUEST=y
 # CONFIG_I7300_IDLE is not set
 # CONFIG_IA32_EMULATION is not set