remove prototypes with no matching function
ok mpi@

Constify struct cfattach.

ok visa@ a long time ago, ok patrick@

remove uneeded includes in md armv7 files

based on include-what-you-use suggestions

Use the fdt root node instead of board ids to gate omap4 specific code.

After factorizing armv7_machdep code here is an effort to factorize all
the code present in omap/omap.c imx/imx.c and sunxi/sunxi.c

All this code looks quite the same, so we move it in a generic arm

After factorizing armv7_machdep code here is an effort to factorize all
the code present in omap/omap.c imx/imx.c and sunxi/sunxi.c

All this code looks quite the same, so we move it in a generic armv7/armv7.c

This is a step closer to only one kernel for all armv7 boards.

ok patrick@, rapha@

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In the future, we shouldn't have one port port ARM SoC, that's just
ridiculous. This is the first step for a common and generic ARM port
for ARMv7 SoCs.