When using the RO_DATA_SECTION macro, all the individual components
are put into the rodata section. As they now end up in the same
section there is no alignment enforced between them anymore. This
leads to unaligned start pointers when any of the components have a
unaligned size. Enforce some alignment between them.

Fixes: c5d38e920101 (lds: Add and use RO_DATA_SECTION macro)
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>