Add a tile service meta-data for QuickAccessWalletServiceInfo that

fetches a drawable for wallet tile.

The wallet tile will get the icon drawable from QAW client; if it
doesn't exist, fall back to the static icon in SysUI.

Test: manual
Bug: 190606984
Fixes: 190539096
Change-Id: I2d822ee34c8e4b27ae72e86186b0d78f2b52854f