Fix @ -> <at> substitution

When applying the AT91CAP9 patches upstream, something transformed
the '@' character into the ' <at> ' sequence.

The patch below restores the original form in all the places where
it has been modified (the AT91CAP9 files, the AT91SAM9260 files which
were copied from AT91CAP9, and a couple of other files where the
' <at> ' sequence was present).

Signed-off-by: Stelian Pop <stelian@popies.net>

cpu/arm926ejs/at91sam9/Makefile

@@ -1,6 +1,6 @@
 #
 # (C) Copyright 2000-2008
-# Wolfgang Denk, DENX Software Engineering, wd <at> denx.de.
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
 # project.

cpu/arm926ejs/at91sam9/ether.c

@@ -1,6 +1,6 @@
 /*
  * (C) Copyright 2007-2008
- * Stelian Pop <stelian.pop <at> leadtechdesign.com>
+ * Stelian Pop <stelian.pop@leadtechdesign.com>
  * Lead Tech Design <www.leadtechdesign.com>
  *
  * See file CREDITS for list of people who contributed to this

cpu/arm926ejs/at91sam9/lowlevel_init.S

@@ -2,7 +2,7 @@
  * AT91CAP9/SAM9 setup stuff
  *
  * (C) Copyright 2007-2008
- * Stelian Pop <stelian.pop <at> leadtechdesign.com>
+ * Stelian Pop <stelian.pop@leadtechdesign.com>
  * Lead Tech Design <www.leadtechdesign.com>
  *
  * See file CREDITS for list of people who contributed to this

cpu/arm926ejs/at91sam9/timer.c

@@ -1,6 +1,6 @@
 /*
  * (C) Copyright 2007-2008
- * Stelian Pop <stelian.pop <at> leadtechdesign.com>
+ * Stelian Pop <stelian.pop@leadtechdesign.com>
  * Lead Tech Design <www.leadtechdesign.com>
  *
  * See file CREDITS for list of people who contributed to this

cpu/arm926ejs/at91sam9/usb.c

@@ -1,6 +1,6 @@
 /*
  * (C) Copyright 2006
- * DENX Software Engineering <mk <at> denx.de>
+ * DENX Software Engineering <mk@denx.de>
  *
  * See file CREDITS for list of people who contributed to this
  * project.