util: Merge util/rgtc.* into src/util/format/u_format_rgtc.*
What does this MR do and why?
util: Merge util/rgtc.* into src/util/format/u_format_rgtc.*
util/rgtc.* are format related staff, src/util/format/u_format_rgtc.* is a better place
Signed-off-by: Yonggang Luo luoyonggang@gmail.com