Pass bootclasspath to kotlinc

Lack of bootclasspath causes lack of libcore classes when compiling
code that would run on a device.

Bug: 73281388
Test: make hidl-doc
Change-Id: I2172740c4e318a7e24d0a40d967ccc91b7226338
diff --git a/java/java.go b/java/java.go
index ae48bd6..3bd07df 100644
--- a/java/java.go
+++ b/java/java.go
@@ -782,6 +782,7 @@
 		kotlinSrcFiles = append(kotlinSrcFiles, uniqueSrcFiles...)
 		kotlinSrcFiles = append(kotlinSrcFiles, srcFiles.FilterByExt(".kt")...)
 
+		flags.kotlincClasspath = append(flags.kotlincClasspath, deps.bootClasspath...)
 		flags.kotlincClasspath = append(flags.kotlincClasspath, deps.kotlinStdlib...)
 		flags.kotlincClasspath = append(flags.kotlincClasspath, deps.classpath...)