Lockscreen Targets: Icon Revamp

Adjust the size of custom app icons and resize and round the corners
of gallery icons for a more uniform look.

Before http://imgur.com/cTOqdwX

After http://imgur.com/EKAeFiw

Change-Id: Ibcca275eb0ae946775773a8c8217b6508da10e5b
Smoother lockscreen framework on low ram devices

512 MB ram devices (crespo)

Signed-off-by: htchoi1995 <htchoi1995@gmail.com>