Revert "Add --enable-earlycon option to vm tool"

This reverts commit ec68eaf6e8ba07cf400cdc33501cdd1a85dfe665.

Reason for revert: Droidmonitor created revert due to b/363003807.

Change-Id: I412b0a1a25eb19371c64bce9e489d4eed2ae7b07
diff --git a/android/vm/src/run.rs b/android/vm/src/run.rs
index 823546f..b3743ae 100644
--- a/android/vm/src/run.rs
+++ b/android/vm/src/run.rs
@@ -148,7 +148,7 @@
 
     let payload_config_str = format!("{:?}!{:?}", config.apk, payload);
 
-    let mut custom_config = CustomConfig {
+    let custom_config = CustomConfig {
         gdbPort: config.debug.gdb.map(u16::from).unwrap_or(0) as i32, // 0 means no gdb
         vendorImage: vendor,
         devices: config
@@ -163,21 +163,6 @@
         ..Default::default()
     };
 
-    if config.debug.enable_earlycon() {
-        if config.debug.debug != DebugLevel::FULL {
-            bail!("earlycon is only supported for debuggable VMs")
-        }
-        if cfg!(target_arch = "aarch64") {
-            custom_config
-                .extraKernelCmdlineParams
-                .push(String::from("earlycon=uart8250,mmio,0x3f8"));
-        } else if cfg!(target_arch = "x86_64") {
-            custom_config.extraKernelCmdlineParams.push(String::from("earlycon=uart8250,io,0x3f8"));
-        } else {
-            bail!("unexpected architecture!");
-        }
-    }
-
     let vm_config = VirtualMachineConfig::AppConfig(VirtualMachineAppConfig {
         name: config.common.name.unwrap_or_else(|| String::from("VmRunApp")),
         apk: apk_fd.into(),