Import various DT files for am437x-sk-evm from Linux Kernel v4.2 Add config file for this board, enable DM, DM_GPIO, DM_SERIAL and DM_MMC. Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com> Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>