Add some OTA related properties to android_device

These will be used to create misc_info.txt

Bug: 398036609
Test: Built and diff'd Make and Soong misc_info.txt
Change-Id: I53cd4f409c9a3a706165119c0d01f1ced5542a2b
diff --git a/android/variable.go b/android/variable.go
index c59857a..7eb08a0 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -721,6 +721,10 @@
 
 	ReleaseToolsExtensionDir string `json:",omitempty"`
 
+	BoardPartialOtaUpdatePartitionsList []string `json:",omitempty"`
+	BoardFlashBlockSize                 string   `json:",omitempty"`
+	BootloaderInUpdatePackage           bool     `json:",omitempty"`
+
 	BoardFastbootInfoFile string `json:",omitempty"`
 }