sunxi: Add sun4i support

Add support for the Allwinner A10 SoC also known as the Allwinner sun4i family,
and add the Cubieboard board which uses the A10 SoC.

Compared to sun7 only the DRAM controller is a bit different:
-Controller reset bits are inverted, but only for Rev. A
-Different hpcr values
-No MBUS on sun4i
-Various other initialization changes

Signed-off-by: Henrik Nordstrom <henrik@henriknordstrom.net>
Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Oliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/boards.cfg b/boards.cfg
index 6f8d168..af24128 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -377,6 +377,7 @@
 Active  arm         armv7          s5pc1xx     samsung         goni                s5p_goni                              -                                                                                                                                 Robert Baldyga <r.baldyga@samsung.com>
 Active  arm         armv7          s5pc1xx     samsung         smdkc100            smdkc100                              -                                                                                                                                 Minkyu Kang <mk7.kang@samsung.com>
 Active  arm         armv7          socfpga     altera          socfpga             socfpga_cyclone5                      -                                                                                                                                 -
+Active  arm         armv7          sunxi       -               sunxi               Cubieboard                            sun4i:CUBIEBOARD,SPL                                                                                                              Hans de Goede <hdegoede@redhat.com>
 Active  arm         armv7          sunxi       -               sunxi               Cubietruck                            sun7i:CUBIETRUCK,SPL,SUNXI_GMAC,RGMII                                                                                             -
 Active  arm         armv7          sunxi       -               sunxi               Cubietruck_FEL                        sun7i:CUBIETRUCK,SPL_FEL,SUNXI_GMAC,RGMII                                                                                         -
 Active  arm         armv7          u8500       st-ericsson     snowball            snowball                              -                                                                                                                                 Mathieu Poirier <mathieu.poirier@linaro.org>