i.MX6: engicam: gpr_init can be called only for some architecture

Fix an invalid usage of the gpr_init function for the imx6ul
architecture
Signed-off-by: NMichael Trimarchi <michael@amarulasolutions.com>
Acked-by: NJagan Teki <jagan@amarulasolutions.com>

board/engicam/common/spl.c

@@ -414,6 +414,7 @@ void board_init_f(ulong dummy)
 	/* setup AIPS and disable watchdog */
 	arch_cpu_init();
 
+	if (!(is_mx6ul()))
 		gpr_init();
 
 	/* iomux */