[target/init.c]: Add code to change the userdata length to 76MB

Add code to change the userdata length to 76MB for msm7627_surf,
msm7627_ffa, msm7630_surf, qsd8250_surf and qsd8250_ffa targets.
diff --git a/target/qsd8250_ffa/init.c b/target/qsd8250_ffa/init.c
index 16991ce..cc7a14d 100644
--- a/target/qsd8250_ffa/init.c
+++ b/target/qsd8250_ffa/init.c
@@ -63,7 +63,7 @@
 	},
 	{
 		.start = 1272,
-		.length = 0,
+		.length = 608 /* 76MB */,
 		.name = "userdata",
 	},
 };