doc: android: Convert to Sphinx format

Convert Android documentation from regular txt format to Sphinx (RST).
Also add Android index.rst file and reference it in root index.rst, so
that Android documentation is visible.

Test:

    $ make htmldocs
    $ xdg-open doc/output/index.html

Signed-off-by: Sam Protsenko <joe.skb7@gmail.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index b0634b2..9dce9f1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -56,7 +56,7 @@
 S:	Maintained
 F:	cmd/ab_select.c
 F:	common/android_ab.c
-F:	doc/android/ab.txt
+F:	doc/android/ab.rst
 F:	include/android_ab.h
 F:	test/py/tests/test_android/test_ab.py
 
@@ -65,7 +65,7 @@
 S:	Maintained
 F:	cmd/avb.c
 F:	common/avb_verify.c
-F:	doc/android/avb2.txt
+F:	doc/android/avb2.rst
 F:	include/avb_verify.h
 F:	lib/libavb/
 F:	test/py/tests/test_android/test_avb.py