boot: support flashing of vendor_kernel_boot image

bbootimg/src/main/kotlin/init/Reboot.kt

@@ -104,6 +104,10 @@ class Reboot {
                                 val bcb = MiscImage.BootloaderMessage.rebootBootloader()
                                 log.info(bcb.toString())
                             }
+                            "quiescent" -> {
+                                val bcb = MiscImage.BootloaderMessage.rebootQuiescent()
+                                log.info(bcb.toString())
+                            }
                             "sideload", "sideload-auto-reboot" -> {
                                 val bcb = MiscImage.BootloaderMessage().apply {
                                     updateBootloaderMessageInStruct(arrayOf("--" + rebootTarget.replace("-", "_")))

bbootimg/src/main/kotlin/packable/VendorBootParser.kt

@@ -98,8 +98,8 @@ class VendorBootParser : IPackable {
     }
 
     fun flash(fileName: String) {
-        val stem = fileName.substring(0, fileName.indexOf("."))
-        super.flash("$fileName.signed", stem)
+        val stem = File(fileName).nameWithoutExtension
+        super.flash(fileName, stem)
 
         if (File("vbmeta.img.signed").exists()) {
             super.flash("vbmeta.img.signed", "vbmeta")

bbootimg/src/main/kotlin/rom/misc/MiscImage.kt

@@ -136,6 +136,12 @@ data class MiscImage(
                 }
             }
 
+            fun rebootQuiescent(): BootloaderMessage {
+                return BootloaderMessage().apply {
+                    command = "boot-quiescent"
+                }
+            }
+
             fun rebootRecovery(): BootloaderMessage {
                 return BootloaderMessage().apply {
                     this.updateBootloaderMessageInStruct(arrayOf())