drm_hwcomposer: Remove hardcoded PAGE_SIZE usage in gralloc_helper
Use getpagesize() to make drm_hwcomposer work with multiple page sizes. This benefits Android as AOSP no longer relies on bionic's PAGE_SIZE macro.
Change-Id: I9af7436ac9ca6c052f67cdd296a960b51b8ba67a Signed-off-by: Vilas Bhat vilasbhat@google.com