imx/mach-mx2: use constants namespaced by the corresponding SOC (easy part)

This just leaves devices.c, generic.c and serial.c to clean up.  As
these files are used on more than one SOC they need some more work.

Signed-off-by: Uwe Kleine-König <[email protected]>
Cc: Holger Schurig <[email protected]>
Cc: Rabin Vincent <[email protected]>
Cc: Javier Martin <[email protected]>
Cc: Valentin Longchamp <[email protected]>
Cc: Jean Delvare <[email protected]>
Cc: Eric Benard <[email protected]>
Cc: Ivo Clarysse <[email protected]>
Cc: Vladimir Barinov <[email protected]>
Cc: Daniel Schaeffer <[email protected]>
Cc: Simon POLETTE <spolette@adnlysd018.(none)>
Cc: Fabio Estevam <[email protected]>
Cc: Alan Carvalho de Assis <[email protected]>
Cc: Luotao Fu <[email protected]>

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