mirrors: don't put atmel mirrors in seperate menu

Show Atmel mirrors together with the other mirrors, instead of hiding
them in yet another sub-menu.

At the same time, add an empty line before the Atmel include as noticed
by Hartley Sweeten.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

target/device/Atmel/Config.in.mirrors

@@ -1,5 +1,3 @@
-menu "Atmel Mirrors"
-
 config BR2_ATMEL_MIRROR
 	string "Atmel AVR32/AT91 download site"
 	default "ftp://www.at91.com/pub/buildroot/"
@@ -27,5 +25,3 @@ config BR2_AT91_PATCH_MIRROR
 	help
 	  Patches for the AT91 generated by the Linux community
 	  usually ends up here, courtesy of Andrew Victor
-
-endmenu

target/device/Config.in.mirrors

@@ -64,6 +64,7 @@ config BR2_DEBIAN_MIRROR
 
 	  Usually, just add your country code like XX here:
 	  http://ftp.XX.debian.org
+
 if BR2_TARGET_ATMEL
 source	"target/device/Atmel/Config.in.mirrors"
 endif