uefi.sh: allow uefi boot script be used on rdn2 platform

Allow RD-N2 platform to use the UEFI boot script to validate boot upto
a edk2 efi shell.
Signed-off-by: Thomas Abraham <thomas.abraham@arm.com>
Change-Id: I36a021300762de3e4e9e43bb937f7458bd1a3860

sgi/uefi.sh

@@ -41,6 +41,7 @@ platforms_rdinfra[rdn1edge]=1
 platforms_rdinfra[rde1edge]=1
 platforms_rdinfra[rdv1]=1
 platforms_rdinfra[rdv1mc]=1
+platforms_rdinfra[rdn2]=1
 
 __print_examples()
 {