ARM: da850_am18xxevm: Remove config and references

This board has been abandonded for a while.  I do not have this hardware
and nobody has appeared to notice and/or care that it's orphaned.
Since much of this code is inserted into the da850evm code base, removing
it from support will make da850evm support easier going forward.
This patch removes the da850_am18xxevm_defconfig, README references to this
board and the reference to this board from the MAINTAINERS list.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/board/davinci/da8xxevm/MAINTAINERS b/board/davinci/da8xxevm/MAINTAINERS
index b77a5f6..42324a3 100644
--- a/board/davinci/da8xxevm/MAINTAINERS
+++ b/board/davinci/da8xxevm/MAINTAINERS
@@ -7,10 +7,6 @@
 F:	configs/da850evm_nand_defconfig
 F:	configs/da850evm_direct_nor_defconfig
 
-AM18XXEVM BOARD
-S:	Orphan
-F:	configs/da850_am18xxevm_defconfig
-
 OMAPL138_LCDK BOARD
 M:	Peter Howard <phoward@gme.net.au>
 S:	Maintained
diff --git a/board/davinci/da8xxevm/README.da850 b/board/davinci/da8xxevm/README.da850
index 5775b7d..8cebdcc 100644
--- a/board/davinci/da8xxevm/README.da850
+++ b/board/davinci/da8xxevm/README.da850
@@ -29,9 +29,7 @@
 ===========
 The exact build target you need will depend on the board you have.  For
 Logic PD boards, or other boards which store the ethernet MAC address at
-the end of SPI flash, run 'make da850evm'.  For boards which store the
-ethernet MAC address in the i2c EEPROM located at 0x50, run
-'make da850_am18xxevm'.  Once this build completes you will have a
+the end of SPI flash, run 'make da850evm'.  Once this build completes you will have a
 u-boot.ais file that needs to be written to the correct persistent
 storage.