aarch64: Address Rust 1.51.0 clippy issue (upper_case_acroynms)

error: name `GPIOInterruptDisabled` contains a capitalized acronym

Error:   --> devices/src/legacy/gpio_pl061.rs:46:5
   |
46 |     GPIOInterruptDisabled,
   |     ^^^^^^^^^^^^^^^^^^^^^ help: consider making the acronym lowercase, except the initial letter: `GpioInterruptDisabled`
   |
   = note: `-D clippy::upper-case-acronyms` implied by `-D warnings`
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

arch/src/lib.rs

@@ -87,7 +87,7 @@ pub mod aarch64;
 
 #[cfg(target_arch = "aarch64")]
 pub use aarch64::{
-    arch_memory_regions, configure_system, configure_vcpu, fdt::DeviceInfoForFDT,
+    arch_memory_regions, configure_system, configure_vcpu, fdt::DeviceInfoForFdt,
     get_host_cpu_phys_bits, get_kernel_start, initramfs_load_addr, layout,
     layout::CMDLINE_MAX_SIZE, layout::IRQ_BASE, layout::IRQ_MAX, EntryPoint,
 };
@@ -128,10 +128,10 @@ pub enum DeviceType {
     Serial,
     /// Device Type: RTC.
     #[cfg(target_arch = "aarch64")]
-    RTC,
+    Rtc,
     /// Device Type: GPIO.
     #[cfg(target_arch = "aarch64")]
-    GPIO,
+    Gpio,
 }
 
 /// Default (smallest) memory page size for the supported architectures.
@@ -146,13 +146,13 @@ impl fmt::Display for DeviceType {
 /// Structure to describe MMIO device information
 #[derive(Clone, Debug)]
 #[cfg(target_arch = "aarch64")]
-pub struct MMIODeviceInfo {
+pub struct MmioDeviceInfo {
     pub addr: u64,
     pub irq: u32,
 }
 
 #[cfg(target_arch = "aarch64")]
-impl DeviceInfoForFDT for MMIODeviceInfo {
+impl DeviceInfoForFdt for MmioDeviceInfo {
     fn addr(&self) -> u64 {
         self.addr
     }