This patch add bindings for Intel KeemBay MSSCAM syscon

v2: fixed compatible (Sam R.)
Signed-off-by: Anitha Chrisanthus <anitha.chrisanthus@intel.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1604538931-26726-3-git-send-email-anitha.chrisanthus@intel.com