proc: Get full file path into handle_vma
proc: Get full file path into handle_vma

Right now we only get first 31 symbols of it, but in the
next patches full path would be required.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>
Looks-good-to-me: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@virtuozzo.com>

eabatalov/criu,KKoukiou/criu-remote,wtf42/criu,efiop/criu,efiop/criu,eabatalov/criu,tych0/criu,AuthenticEshkinKot/criu,efiop/criu,ldu4/criu,wtf42/criu,ldu4/criu,ldu4/criu,tych0/criu,KKoukiou/criu-remote,AuthenticEshkinKot/criu,eabatalov/criu,eabatalov/criu,AuthenticEshkinKot/criu,tych0/criu,tych0/criu,efiop/criu,tych0/criu,wtf42/criu,KKoukiou/criu-remote,eabatalov/criu,tych0/criu,ldu4/criu,KKoukiou/criu-remote,KKoukiou/criu-remote,wtf42/criu,efiop/criu,AuthenticEshkinKot/criu,wtf42/criu,ldu4/criu,AuthenticEshkinKot/criu,ldu4/criu,wtf42/criu,AuthenticEshkinKot/criu,efiop/criu,KKoukiou/criu-remote,eabatalov/criu