asm-generic: Consolidate errno.h to asm-generic/errno.h

This patch use blackfin errno.h implementation which
correspond Linux kernel one.

MIPS implemetation is different that's why I keep it.

I removed ppc_error_no.h from Marvell boards which
was the same too.

I have got ack from ppc40x, blackfin, arm, coldfire and avr custodians.

Acked-by: Stefan Roese <sr@denx.de>
Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/board/Marvell/db64360/mv_eth.h b/board/Marvell/db64360/mv_eth.h
index 943d30b..142910b 100644
--- a/board/Marvell/db64360/mv_eth.h
+++ b/board/Marvell/db64360/mv_eth.h
@@ -37,8 +37,7 @@
 #include <common.h>
 #include <net.h>
 #include "mv_regs.h"
-#include "../common/ppc_error_no.h"
-
+#include <asm/errno.h>
 
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