sgi/boot: add rddanielxlr as a supported platform

Enable busy box boot test for rddanielxlr platform.

Change-Id: I5ec1ea67b1359e7579fe10a45ced2aa192a8df6a
Signed-off-by: Aditya Angadi <aditya.angadi@arm.com>

sgi/boot.sh

@@ -41,6 +41,7 @@ platforms_rdinfra[rdn1edge]=1
 platforms_rdinfra[rdn1edgex2]=1
 platforms_rdinfra[rde1edge]=1
 platforms_rdinfra[rddaniel]=1
+platforms_rdinfra[rddanielxlr]=1
 
 __print_examples()
 {