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-mx2/mach-mxt_td60.c b/arch/arm/mach-mx2/mach-mxt_td60.c
index 9ed4e49..df954d8 100644
--- a/arch/arm/mach-mx2/mach-mxt_td60.c
+++ b/arch/arm/mach-mx2/mach-mxt_td60.c
@@ -286,7 +286,7 @@
 	/* maintainer: Maxtrack Industrial */
 	.phys_io	= MX27_AIPI_BASE_ADDR,
 	.io_pg_offst	= ((MX27_AIPI_BASE_ADDR_VIRT) >> 18) & 0xfffc,
-	.boot_params	= PHYS_OFFSET + 0x100,
+	.boot_params	= MX27_PHYS_OFFSET + 0x100,
 	.map_io		= mx27_map_io,
 	.init_irq	= mx27_init_irq,
 	.init_machine	= mxt_td60_board_init,