adp-ag101: add board adp-ag101 support

Add evaluation board "adp-ag101" configuration file adp-ag101.h.
Add adp-ag101.c board config and related settings.
Add board adp-ag101 into boards.cfg

Signed-off-by: Macpaul Lin <macpaul@andestech.com>
diff --git a/boards.cfg b/boards.cfg
index fff132f..738c186 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -324,6 +324,7 @@
 vct_platinumavc_onenand_small mips       mips32      vct                 micronas       -           vct:VCT_PLATINUMAVC,VCT_ONENAND,VCT_SMALL_IMAGE
 qi_lb60                      mips        xburst      qi_lb60             qi
 nios2-generic                nios2       nios2       nios2-generic       altera
+adp-ag101                    nds32       n1213       adp-ag101           AndesTech      ag101
 PCI5441                      nios2       nios2       pci5441             psyent
 PK1C20                       nios2       nios2       pk1c20              psyent
 EVB64260                     powerpc     74xx_7xx    evb64260            -              -           EVB64260