Merge branch 'macb-usrio-cap'

Neil Armstrong says:

====================
Add new capability and macb DT variant

The first patch introduces a new capability bit to disable usage of the
USRIO register on platform not implementing it thus avoiding some external
imprecise aborts on ARM based platforms.
The two last patchs adds a new macb variant compatible name using the
capability, the NP4 SoC uses this particular hardware configuration.

v1: http://lkml.kernel.org/r/1449485914-12883-1-git-send-email-narmstrong@baylibre.com
v2: http://lkml.kernel.org/r/1449582726-6148-1-git-send-email-narmstrong@baylibre.com
v3: http://lkml.kernel.org/r/1451898103-21868-1-git-send-email-narmstrong@baylibre.com
v4: http://lkml.kernel.org/r/1451900573-22657-1-git-send-email-narmstrong@baylibre.com
v5: switch SoC name to non-generic NP4 name
====================

Signed-off-by: David S. Miller <davem@davemloft.net>