config: armv7hl: Disable OMAP DRM
    
    To avoid errors such as:
    
      ../drivers/gpu/drm/omapdrm/omap_plane.c: In function 'omap_plane_pre_apply':
      ../drivers/gpu/drm/omapdrm/omap_plane.c:145:2: error: format '%x' expects argument of type 'unsigned int', but argument 5 has type 'dma_addr_t' [-Werror=format=]
        DBG("%d,%d %08x %08x", info->pos_x, info->pos_y,
        ^
      ../drivers/gpu/drm/omapdrm/omap_plane.c:145:2: error: format '%x' expects argument of type 'unsigned int', but argument 6 has type 'dma_addr_t' [-Werror=format=]
      cc1: all warnings being treated as errors
    
    disable OMAP DRM for now.
    
    Two patches were sent upstream by Matwey V. Kornilov but didn't find
    their way into v3.16. Once patches are applied, revert this commit.
    
    Signed-off-by: Andreas Färber <afaerber@suse.de>