brillo_base: Remove dependency on Java

Set JAVA_NOT_REQUIRED so the build system
does not demand that a jdk be installed.

Also do not build the android recovery image
as this is not used by Brillo and requires java tooling.

BUG: 25281898
Change-Id: If58944a42c6d4ab0266f6931be3516c3046558e6
(cherry picked from commit c779186128b99b00e6dd5983f5c1f279e9faa9e4)
diff --git a/brillo_base.mk b/brillo_base.mk
index 3101c59..f13560a 100644
--- a/brillo_base.mk
+++ b/brillo_base.mk
@@ -308,6 +308,12 @@
 BRILLO := 1
 COMMON_GLOBAL_CFLAGS += -D__BRILLO__
 
+# Java is not used or required for Brillo.
+JAVA_NOT_REQUIRED := true
+
+# Brillo does not use the Android recovery image.
+TARGET_NO_RECOVERY := true
+
 # Generate Breakpad symbols.
 BREAKPAD_GENERATE_SYMBOLS := true