fix(fvp): remove Cortex-A72x4-A53x4 leftovers

FVP_Base-A72x4-A53x4 support was removed in fa86cf6c but this file still
exists. Remove it.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: Icfdda9d5cf2dc9ff710270cbefcf78b2fa921906
1 file changed