refactor: vmm: remove redundant allocate_64bit_mmio_memory wrapper

Following same logic from previous commit, remove this wrapper as well.

Signed-off-by: Egor Lazarchuk <yegorlz@amazon.co.uk>

Author: ShadowCurse

src/vmm/src/vstate/resources.rs

@@ -109,27 +109,6 @@ impl ResourceAllocator {
         allocate_many_ids(&mut self.gsi_msi_allocator, gsi_count)
     }
 
-    /// Allocate a memory range in 64-bit MMIO address space
-    ///
-    /// If it succeeds, it returns the first address of the allocated range
-    ///
-    /// # Arguments
-    ///
-    /// * `size` - The size in bytes of the memory to allocate
-    /// * `alignment` - The alignment of the address of the first byte
-    /// * `policy` - A [`vm_allocator::AllocPolicy`] variant for determining the allocation policy
-    pub fn allocate_64bit_mmio_memory(
-        &mut self,
-        size: u64,
-        alignment: u64,
-        policy: AllocPolicy,
-    ) -> Result<u64, vm_allocator::Error> {
-        Ok(self
-            .mmio64_memory
-            .allocate(size, alignment, policy)?
-            .start())
-    }
-
     /// Allocate a memory range for system data
     ///
     /// If it succeeds, it returns the first address of the allocated range
@@ -284,19 +263,12 @@ mod tests {
         assert_eq!(irq_1, GSI_LEGACY_START + 1);
         let gsi_1 = allocator1.allocate_gsi_msi(1).unwrap()[0];
         assert_eq!(gsi_1, GSI_MSI_START + 1);
-        let mmio64_mem = allocator1
-            .allocate_64bit_mmio_memory(0x42, 1, AllocPolicy::FirstMatch)
-            .unwrap();
-        assert_eq!(mmio64_mem, arch::MEM_64BIT_DEVICES_START);
         let system_mem = allocator1
             .allocate_system_memory(0x42, 1, AllocPolicy::FirstMatch)
             .unwrap();
         assert_eq!(system_mem, arch::SYSTEM_MEM_START);
 
         let mut allocator2 = clone_allocator(&allocator1);
-        allocator2
-            .allocate_64bit_mmio_memory(0x42, 1, AllocPolicy::ExactMatch(mmio64_mem))
-            .unwrap_err();
         allocator2
             .allocate_system_memory(0x42, 1, AllocPolicy::ExactMatch(system_mem))
             .unwrap_err();
@@ -305,10 +277,6 @@ mod tests {
         assert_eq!(irq_2, GSI_LEGACY_START + 2);
         let gsi_2 = allocator2.allocate_gsi_msi(1).unwrap()[0];
         assert_eq!(gsi_2, GSI_MSI_START + 2);
-        let mmio64_mem = allocator1
-            .allocate_64bit_mmio_memory(0x42, 1, AllocPolicy::FirstMatch)
-            .unwrap();
-        assert_eq!(mmio64_mem, arch::MEM_64BIT_DEVICES_START + 0x42);
         let system_mem = allocator1
             .allocate_system_memory(0x42, 1, AllocPolicy::FirstMatch)
             .unwrap();