Remove the bootloader partition

Originally we planned to support updating this OTA, but we haven't
implemented that yet and it is causing some problems for other projects.

The bootloader is still loaded into memory with crosvm/QEMU's BIOS
support, so continues to function.

Change-Id: I3f86518bd694cf1cecb9c6132875da2975a8dcc8

host/commands/assemble_cvd/disk_flags.cc

diff --git a/host/commands/assemble_cvd/disk_flags.cc b/host/commands/assemble_cvd/disk_flags.cc
index 6b1ac70..8ce2c04 100644
--- a/host/commands/assemble_cvd/disk_flags.cc
+++ b/host/commands/assemble_cvd/disk_flags.cc
@@ -155,12 +155,6 @@
     .label = "misc",
     .image_file_path = FLAGS_misc_image,
   });
-  if (FLAGS_use_bootloader) {
-    partitions.push_back(ImagePartition {
-      .label = "bootloader",
-      .image_file_path = FLAGS_bootloader,
-    });
-  }
   if (!FLAGS_esp.empty()) {
     partitions.push_back(ImagePartition {
       .label = "esp",