drivers: virtio: fix cleanup upon failure during virtqueues initialization

This commit fixes infinite loop reported in
https://github.com/zephyrproject-rtos/zephyr/issues/91242

, not deallocating
array with virtqueues and not deactivating the virtqueues in case of
failure

Signed-off-by: Jakub Michalski <jmichalski@antmicro.com>