Fix: Initialize .bss in sp environment startup code

Clear .bss on SP startup to have a clear starting point regardless of
the behavior of the loader. The code relies on having the .bss filled
with zeroes on startup, otherwise it will result in undefined behavior.

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: Ic5cdafc2a041b0e709cd8e8acb59caa45957fa1d
2 files changed