bp2build: Allowlist and build fastboot with Bazel.

Test: $ b build //system/core/fastboot:fastboot --config=linux_x86_64 &&
bazel-bin/system/core/fastboot/fastboot --help

Change-Id: I70159a49e7fdfbb8a0b653161e9ea2a9eeeab977
diff --git a/android/allowlists/allowlists.go b/android/allowlists/allowlists.go
index 4329d5d..a3899e4 100644
--- a/android/allowlists/allowlists.go
+++ b/android/allowlists/allowlists.go
@@ -333,6 +333,13 @@
 		"server_configurable_flags",
 		"tensorflow_headers",
 
+		// fastboot
+		"bootimg_headers",
+		"fastboot",
+		"libfastboot",
+		"liblp",
+		"libstorage_literals_headers",
+
 		//external/avb
 		"avbtool",
 		"libavb",