fix(tbbr): remove tbbr_cot_bl1_r64.c

The only platform to use this is fvp_r. As this platform is now gone, so
is the need for this file. Remove it

Change-Id: If65f1c5f525283e19c8421cfa31498480370b933
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
1 file changed