android-tools: fix issue with missing files in eSDK updates

If this recipe was included in an eSDK and then eSDK incremental updates were
generated by repeatedly running the oe-publish-sdk script, after installing the
first of such updates, and any following as well, with 'devtool sdk-updates' the
eSDK gets corrupted. Indeed some of the files listed in SRC_URI (namely anything
in *.patch and *.service) get deleted by those updates, with bitbake that starts
warning with 'Unable to get checksum for android-tools* SRC_URI entry' at every
parse. Since the files are missing, such warnings turn into errors if trying to
bake android-tools.

The root cause is the somewhat unusual presence of android-tools/.gitignore,
indeed ignore everything not explicitly excepted. When oe-publish-sdk creates
the git repo it relies on to feed eSDK updates, the .gitignore gets honored,
leading to the buggy behaviour above.

This patch adds *.patch and *.service to the excepted patterns in .gitignore
Note that, although this solves the issue, it does not prevent from it popping
up again if new files get added to android-tools/ without explicitly excluding
them from .gitignore.

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-devtools/android-tools/android-tools/.gitignore

@@ -3,6 +3,8 @@
 !*.indirectionsymlink
 !*.[ch]
 !*.mk
+!*.patch
+!*.service
 !NOTICE
 !MODULE_LICENSE_*
 !/system/