ARM: mxs: Add PPC-AG BG0900 board

This board supports FEC Ethernet, SPI NOR and NAND flash.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Christoph Baumann <c.baumann@ppc-ag.de>
diff --git a/boards.cfg b/boards.cfg
index 2461d3b..cec154b 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -207,6 +207,7 @@
 Active  arm         arm926ejs      mxs         freescale       mx28evk             mx28evk_auart_console                mx28evk:MXS_AUART,MXS_AUART_BASE=MXS_UARTAPP3_BASE,ENV_IS_IN_MMC                                                                  Fabio Estevam <fabio.estevam@freescale.com>
 Active  arm         arm926ejs      mxs         freescale       mx28evk             mx28evk_nand                         mx28evk:ENV_IS_IN_NAND                                                                                                            Fabio Estevam <fabio.estevam@freescale.com>
 Active  arm         arm926ejs      mxs         olimex          mx23_olinuxino      mx23_olinuxino                       mx23_olinuxino                                                                                                                    Marek Vasut <marek.vasut@gmail.com>
+Active  arm         arm926ejs      mxs         ppcag           bg0900              bg0900                               bg0900                                                                                                                            Marek Vasut <marex@denx.de>
 Active  arm         arm926ejs      mxs         sandisk         sansa_fuze_plus     sansa_fuze_plus                      -                                                                                                                                 Marek Vasut <marek.vasut@gmail.com>
 Active  arm         arm926ejs      mxs         schulercontrol  sc_sps_1            sc_sps_1                             -                                                                                                                                 Marek Vasut <marek.vasut@gmail.com>
 Active  arm         arm926ejs      nomadik     st              nhk8815             nhk8815                              -                                                                                                                                 Nomadik Linux Team <STN_WMM_nomadik_linux@list.st.com>:Alessandro Rubini <rubini@unipv.it>