Exynos5420: Introduce support for the Peach-Pit board

While the Exynos5420 chip is used in both Smdk5420 and in the Peach-Pit
line of devices, there could be other boards using the same chip, so a
common configuration file is being added (exynos5420.h) as well
as two common device tree files (exynos54xx.dtsi & exynos5420.dtsi).

The peach board as declared in boards.cfg is a copy of smdk5420
declaration. The configuration files are similar, but define different
default device trees, console serial ports and prompts.

The device tree files for smdk5420 and peach-pit inherit from the same
common file.

Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/boards.cfg b/boards.cfg
index 5a85fad..1527ebe 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -293,6 +293,7 @@
 Active  arm         armv7          exynos      samsung         smdk5250            smdk5250                              -                                                                                                                                 Chander Kashyap <k.chander@samsung.com>
 Active  arm         armv7          exynos      samsung         smdk5250            snow                                  -                                                                                                                                 Rajeshwari Shinde <rajeshwari.s@samsung.com>
 Active  arm         armv7          exynos      samsung         smdk5420            smdk5420                              -                                                                                                                                 Rajeshwari Shinde <rajeshwari.s@samsung.com>
+Active  arm         armv7          exynos      samsung         smdk5420            peach-pit                             -                                                                                                                                 Akshay Saraswat <akshay.s@samsung.com>
 Active  arm         armv7          exynos      samsung         smdkv310            smdkv310                              -                                                                                                                                 Chander Kashyap <k.chander@samsung.com>
 Active  arm         armv7          exynos      samsung         trats               trats                                 -                                                                                                                                 Lukasz Majewski <l.majewski@samsung.com>
 Active  arm         armv7          exynos      samsung         trats2              trats2                                -                                                                                                                                 Piotr Wilczek <p.wilczek@samsung.com>