misc: Further improve imports styling

By introducing `imports_granularity="Module"` format strategy,
effectively groups imports from the same module into one line or block,
improving maintainability and readability.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

devices/src/gic.rs

@@ -9,10 +9,8 @@ use std::sync::{Arc, Mutex};
 
 use anyhow::anyhow;
 use arch::layout;
-use hypervisor::{
-    arch::aarch64::gic::{Vgic, VgicConfig},
-    CpuState, GicState,
-};
+use hypervisor::arch::aarch64::gic::{Vgic, VgicConfig};
+use hypervisor::{CpuState, GicState};
 use vm_device::interrupt::{
     InterruptIndex, InterruptManager, InterruptSourceConfig, InterruptSourceGroup,
     LegacyIrqSourceConfig, MsiIrqGroupConfig,