[rialto][MMIO] Remove redundant memory mapping for MMIO range

This cl removes the redundant memory mapping for the MMIO range
since the MMIO memory mapping will now be managed through the
MemoryTracker.

Bug: 284462758
Test: atest rialto_test
Change-Id: I8cd40355a50bcbe93167414fe2c22f12796709b8
diff --git a/rialto/src/main.rs b/rialto/src/main.rs
index ce83624..95c49ac 100644
--- a/rialto/src/main.rs
+++ b/rialto/src/main.rs
@@ -42,7 +42,6 @@
 fn new_page_table() -> Result<PageTable> {
     let mut page_table = PageTable::default();
 
-    page_table.map_device(&crosvm::MMIO_RANGE)?;
     page_table.map_data(&layout::scratch_range())?;
     page_table.map_data(&layout::stack_range(40 * PAGE_SIZE))?;
     page_table.map_code(&layout::text_range())?;