Gallery2: fix can not add gallery widget to home screen

When selected to add a cropped picture to home screen,
the binder transaction failed because it was too large,
add widget failed.

We reduce the allowed maximum bitmap size in intent,
to make sure that binder size will not greater than 1M.

CRs-Fixed: 528927

Change-Id: Id63c8503dead66ab18531a78b0b4206d1fd30d07