This option has a bool type, not hex.
Fix it and enable it if CONFIG_DM is on because Driver Model always
requires malloc memory.  Devices are scanned twice, before/after
relocation.  CONFIG_SYS_MALLOC_F should be enabled to use malloc
memory before relocation.  As it is board-independent, handle it
globally.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NStephen Warren <swarren@wwwdotorg.org>
Reviewed-by: NSimon Glass <sjg@chromium.org>
Acked-by: NRobert Baldyga <r.baldyga@samsung.com>