drm/amd/display: rename bandwidth_calcs.c to dce_calcs.c (v2)

v2: agd: squash in the Makefile change as well.
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Eagle Yeh <eagle.yeh@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/calcs/Makefile

@@ -3,7 +3,7 @@
 # It calculates Bandwidth and Watermarks values for HW programming
 #
 
-BW_CALCS = bandwidth_calcs.o bw_fixed.o custom_float.o
+BW_CALCS = dce_calcs.o bw_fixed.o custom_float.o
 
 AMD_DAL_BW_CALCS = $(addprefix $(AMDDALPATH)/dc/calcs/,$(BW_CALCS))