Add ATSTK100[234] to MAINTAINERS

Add all the ATSTK1000 daughterboards to MAINTAINERS along with their
"mother". Also update the entry for ATSTK1000 to be not only about the
AP7000 CPU; it's intended to handle all CPUs in the AT32AP family.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index b8c1fdc..ccf4d35 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -630,7 +630,10 @@
 
 Haavard Skinnemoen <hskinnemoen@atmel.com>
 
-	ATSTK1000		AT32AP7000
+	ATSTK1000		AT32AP7xxx
+	ATSTK1002		AT32AP7000
+	ATSTK1003		AT32AP7001
+	ATSTK1004		AT32AP7002
 
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 # End of MAINTAINERS list						#