ARM: imx: mark .dt_compat as const

Otherwise GCC will mark the .init.rodata section R/W, which causes
a compile error once we add other real R/O data.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

diff --cc arch/arm/mach-imx/imx31-dt.c
Simple merge

diff --cc arch/arm/mach-imx/imx35-dt.c
Simple merge

diff --cc arch/arm/mach-imx/mach-imx50.c
Simple merge

diff --cc arch/arm/mach-imx/mach-imx51.c
Simple merge

diff --cc arch/arm/mach-imx/mach-imx53.c
Simple merge

diff --cc arch/arm/mach-imx/mach-imx6q.c
Simple merge

diff --cc arch/arm/mach-imx/mach-imx6sl.c
Simple merge

diff --cc arch/arm/mach-imx/mach-imx6sx.c
Simple merge

diff --cc arch/arm/mach-imx/mach-vf610.c
Simple merge