Revert DTB patches to in-place binary patches

Since we no longer need to add new properties in the device tree, and
all the patches we do removes strings, we can just directly patch
the flat device tree in-place, ignoring basically all the higher level
DTB structure and format to accomplish 100% compatibility.

native/jni/magiskboot/main.cpp

@@ -42,7 +42,7 @@ Supported actions:
     Search <hexpattern1> in <file>, and replace with <hexpattern2>
 
   cpio <incpio> [commands...]
-    Do cpio commands to <incpio> (modifications are done directly)
+    Do cpio commands to <incpio> (modifications are done in-place)
     Each command is a single argument, add quotes for each command
     Supported commands:
       exists ENTRY
@@ -64,8 +64,8 @@ Supported actions:
         Return values:
         0:stock    1:Magisk    2:unsupported (phh, SuperSU, Xposed)
       patch
-        Apply ramdisk patches. Configure settings with env variables:
-        KEEPVERITY KEEPFORCEENCRYPT
+        Apply ramdisk patches
+        Configure with env variables: KEEPVERITY KEEPFORCEENCRYPT
       backup ORIG
         Create ramdisk backups from ORIG
       restore
@@ -79,10 +79,10 @@ Supported actions:
       print [-f]
         Print all contents of dtb for debugging
         Specify [-f] to only print fstab nodes
-      patch [OUT]
+      patch
         Search for fstab and remove verity/avb
-        If [OUT] is not specified, it will directly output to <input>
-        Configure with env variables: KEEPVERITY TWOSTAGEINIT
+        Modifications are done directly to the file in-place
+        Configure with env variables: KEEPVERITY
 
   split <input>
     Split image.*-dtb into kernel + kernel_dtb
@@ -186,7 +186,7 @@ int main(int argc, char *argv[]) {
 	} else if (argc > 2 && action == "cpio"sv) {
 		if (cpio_commands(argc - 2, argv + 2))
 			usage(argv[0]);
-	} else if (argc > 2 && action == "dtb") {
+	} else if (argc > 3 && action == "dtb") {
 		if (dtb_commands(argc - 2, argv + 2))
 			usage(argv[0]);
 	} else {