mtd: misplaced log.h and dm/devres.h

log.h and dm/devres.h are U-Boot includes. So placing them
behind #ifndef __UBOOT__ does not make any sense.

Fixes: f7ae49fc ("common: Drop log.h from common header")
Fixes: 61b29b82 ("dm: core: Require users of devres to include the header")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>