implemented ability to enable -D_FF_RV_EXIST_ in TIF library It is not clear if this quirk is intentional or not, but TI's production version of tif_na7_db_{fl,ir}.lib was built without -D_FF_RV_EXIST_, and as a result, the code that is present in the source for the TRACEMASK_IN_FFS feature was not compiled in, making the feature unavailable. The present change makes it possible to re-enable this code (when TIF libraries are being rebuilt from source rather than used as blobs) by setting TRACEMASK_IN_FFS=1 on the configure line. The new code is NOT enabled by default: it is not a change which we can justify inflicting on our production firmwares.

########################################
# LIBRARIES / MODULES definition       #
########################################

# to avoid multiple drivers.def (import + include) 
ifndef TPU_DRIVERS_DEF
   TPU_DRIVERS_DEF = 1

TPU_DRIVERS_LIB_DIR = $(OUT_LIB_DIR)
TPU_DRIVERS_LIB     = $(TPU_DRIVERS_LIB_DIR)/tpudrv_$(CUST)_$(RF_FAM)_$(CHIPSET)_$(ANLG_FAM)_$(DSP)_$(BOARD)_$(LONG_JUMP)_$(TESTMODE).lib

TI_LIBS += $(TPU_DRIVERS_LIB)
MODULES += $(TPU_DRIVERS_DIR)

TI_BSS_LIBS   += $(TPU_DRIVERS_LIB) (.bss)
TI_CONST_LIBS += $(TPU_DRIVERS_LIB) (.const, .text)

export TPU_DRIVERS_LIB

endif