AAPT2: Allow for nested inline xmls

Add recursion to InlineXmlFormatParser::Consume for handling nested
aapt:attr

Change-Id: Iabf98945b4f5ef22a3b8fdc4ca2bac092a377629
Fixes: 64385167
Test: make aapt2_tests
(cherry picked from commit 7b6b02bd13aea90b938c3ab3b1eaa3fb5043f931)
2 files changed