style: normalize linker script code style

There are a variety of code styles used by the various linker scripts
around the code-base. This change brings them in line with one another
and attempts to make the scripts more friendly for skim-readers.

Change-Id: Ibee2afad0d543129c9ba5a8a22e3ec17d77e36ea
Signed-off-by: Chris Kay <chris.kay@arm.com>
(cherry picked from commit f90fe02f061b8a203391e566682221396b656c6f)
8 files changed