arc: add AXS101 board support

AXS101 is a new generation of devlopment boards from Synopsys that houses
ASIC with ARC700 and lots of DesignWare peripherals:

 * DW APB UART
 * DW Mobile Storage (MMC/SD)
 * DW I2C
 * DW GMAC

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Francois Bedard <fbedard@synopsys.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Heiko Schocher <hs@denx.de>
diff --git a/boards.cfg b/boards.cfg
index de39bfa..c97c4bd 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -1230,6 +1230,7 @@
 Active  sparc       leon3          -           gaisler         -                   gr_xc3s_1500                         -                                                                                                                                 -
 Active  sparc       leon3          -           gaisler         -                   grsim                                -                                                                                                                                 -
 Active  x86         x86            coreboot    chromebook-x86  coreboot            coreboot-x86                         coreboot:SYS_TEXT_BASE=0x01110000                                                                                                 -
+Active  arc         arc700         -           synopsys        -                   axs101                               -                                                                                                                                 Alexey Brodkin <abrodkin@synopsys.com>
 Active  arc         arc700         -           synopsys        -                   arcangel4                            -                                                                                                                                 Alexey Brodkin <abrodkin@synopsys.com>
 Active  arc         arc700         -           synopsys        arcangel4           arcangel4-be                            -                                                                                                                              Alexey Brodkin <abrodkin@synopsys.com>
 Orphan  arm         arm1136        mx31        -               imx31_phycore       imx31_phycore_eet                    imx31_phycore:IMX31_PHYCORE_EET                                                                                                   (resigned) Guennadi Liakhovetski <g.liakhovetski@gmx.de>