The touch exploration capability is dynamically granted pre-JellyBeanMR2.

Since the enable touch exploration capability is dynamically granted by
the user for apps targeting pre-JellybeanMR2 API level, we have to properly
update the accessibility service info for that service and also avoid
caching copies of the service info.

bug:8633951

Change-Id: I83dd1c852706ec55d40cda7209ad842889fb970a
3 files changed