imx: define per SOC ..._PHYS_OFFSET and use these in favour of PHYS_OFFSET

This is a further step in allowing to build a kernel image for more
than one imx SOC.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
diff --git a/arch/arm/mach-mx3/mach-mx31lilly.c b/arch/arm/mach-mx3/mach-mx31lilly.c
index 9225cb7..80847b0 100644
--- a/arch/arm/mach-mx3/mach-mx31lilly.c
+++ b/arch/arm/mach-mx3/mach-mx31lilly.c
@@ -197,7 +197,7 @@
 MACHINE_START(LILLY1131, "INCO startec LILLY-1131")
 	.phys_io	= MX31_AIPS1_BASE_ADDR,
 	.io_pg_offst	= (MX31_AIPS1_BASE_ADDR_VIRT >> 18) & 0xfffc,
-	.boot_params	= PHYS_OFFSET + 0x100,
+	.boot_params	= MX3x_PHYS_OFFSET + 0x100,
 	.map_io		= mx31_map_io,
 	.init_irq	= mx31_init_irq,
 	.init_machine	= mx31lilly_board_init,