risc-v: qemu: imply NVME_PCI

CONFIG_NVME=y without CONFIG_NVME_PCI=y does not provide working NVMe
support. Instead of implying CONFIG_NVME we must imply CONFIG_NVME_PCI
which will select CONFIG_NVME.

Fixes: e64db0d9 ("riscv: qemu: Enable e1000 and nvme support")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Mark Kettenis <kettenis@openbsd.org>