Move and merge modified sf_config/config files to be underneath foundation_system in line with the restructure that occurred as part of fc38b048ab2f.
# sf_config level configuration makefile
#Define this platform as default if nothing is defined
ifeq (,$(S60))
S60 += 91
$(warning S60 platform not defined (E.g. S60=91)! Using $(S60))
endif
ifeq (91,$(findstring 91,$(S60)))
MAKEFILE = /sf/config/sf_config/Makefile
sf_all :: sf_config
sf_config ::
sf_config :: config
config_all :: sf_all
include include_template.mk
endif