MLECO-5658: Adding function sections

Updated bare-metal toolchain files to always add function
and data sections for both toolchains. This will reduce
runtime code footprint. Again, it was previously disabled
for legacy reasons (timing adapter driver implementation)
that are no longer relevant.

Change-Id: I15aa57d1cadcf2b92a5b9e01bd1d113161c67e84
Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>