(2/3) allow to configure lcd density

Change-Id: I8366d29027f3ac75f61ae727bd865dceede42c06
exynos4: getphys implementation on buffermanager for samsung omx

Change-Id: Iee665f56aaf601479d796703db983ca5fce9c5c3
ui: exynos4: getphys is common

Change-Id: I1dc9c2ced0700072e7c30c8435676873b10c7026