tests: disk/disk_performance: add CONFIG_NVME for qemu_x86_64

qemu_x86_64 has NVME disk as overlay so we need to enable
kconfig CONFIG_NVME or else it would fail to compile.

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

tests/drivers/disk/disk_performance/boards/qemu_x86_64.conf

@@ -3,3 +3,4 @@ CONFIG_PCIE=y
 CONFIG_PCIE_MSI=y
 CONFIG_PCIE_MSI_X=y
 CONFIG_PCIE_MSI_MULTI_VECTOR=y
+CONFIG_NVME=y