meta-aspeed: remove meta-phosphor dependency

meta-aspeed does not have a hard dependency on meta-phosphor, so global
configuration from meta-phosphor should be "include" and not "require".

Change-Id: I6bc9e579a89665924713bc3094119a2b8cc5b925
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-aspeed/conf/machine/evb-ast2600.conf b/meta-aspeed/conf/machine/evb-ast2600.conf
index 7dd4489..c30cb5c 100644
--- a/meta-aspeed/conf/machine/evb-ast2600.conf
+++ b/meta-aspeed/conf/machine/evb-ast2600.conf
@@ -14,7 +14,7 @@
 SOCSEC_SIGN_ENABLE = "0"
 
 require conf/machine/include/ast2600.inc
-require conf/machine/include/obmc-evb-common.inc
+include conf/machine/include/obmc-evb-common.inc
 
 SERIAL_CONSOLES = "115200;ttyS4"