Build: Don't create empty bss sections

If a section is empty, and '.' is aligned in the section, the gcc linker
returns a warning.

To avoid this warning add 4 bytes data to the partition bss sections if
they are empty.

Change-Id: I5b24f07927855fd0b2468b1c17ec1a06f170962a
Signed-off-by: Mate Toth-Pal <mate.toth-pal@arm.com>
2 files changed