Use plain function call instead of invoking function pointer

util.c: Rename /proc/summary into /proc/flashbench

Remove unused field: make_write_request

Move timer_get_timestamp_in_us() from util.c to bus_controller.c

util.c: Remove unused functions

util.c: Remove redundant global & static variables

util.c: Refactor fb_proc_summary(), perf_display_result()

Add missing header includes

Add .gitattributes

util.c: Resolve warnings

Fix missing includes from headers

Don't compare with NULL

write_buffer.c: Simplify codes

util.c: Organize codes

ssd_info.c: Organize codes