[ARM] Linker script corrected for the "readmostly" section.

The .readmostly.data section was out of the copied sections.
Now, all *.data sections are in the .data one.

Signed-off-by: Jimmy Durand Wesolowski <jimmy.durand-wesolowski@openwide.fr>
Signed-off-by: Anup Patel <anup@brainfault.org>