Rename the confusing and misleading ts5x00 directory to a real reference
platform name, ts5500. The readme.txt file already states the support
for both TS-5500 and TS-5400 platforms.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
