Memory Footprint: Simplify logics to parse configs

Build configs are available via Jenkins env params. There is no need to
parse build configs with build manager, which makes the code hard to
understand.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I3299fd08f268e020c3f0bfb829f8acd4dd4de06c
3 files changed