sdm: Increase UI FB Id map size limit to 4

Increase the FB Id map size limit of UI layers to 4, to account for
Quad Buffering, which gets enabled on devices which support Refresh
rates higher than 60 fps.

CRs-Fixed: 2751477
Change-Id: I63400bb421169548ca0afde51681a006b81ccd79
1 file changed