Check build MODE to check gpiod fw.

Some Android doesn't support gpiod frameworks. So check MODE to include
gpiod fw. It should be determined before building.

Signed-off-by: Luke go <sangch.go@gmail.com>
Change-Id: I5b4627c86b4b083622822576c5afa0dd72894faf
diff --git a/Android.bp b/Android.bp
index 09cb428..437a84b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -56,6 +56,7 @@
     cflags: [
         "-UNDEBUG",
         "-DANDROID",
+        "-DDEVMEM",
         "-Wno-return-type",
     ],