imgtec: Update MAINTAINERS for more config files

Cover all of the boston and malta variations.

Signed-off-by: Tom Rini <trini@konsulko.com>

board/imgtec/boston/MAINTAINERS

@@ -3,4 +3,7 @@ M:	Paul Burton <paul.burton@imgtec.com>
 S:	Maintained
 F:	board/imgtec/boston/
 F:	include/configs/boston.h
-F:	configs/boston_defconfig
+F:	configs/boston32r2_defconfig
+F:	configs/boston32r2el_defconfig
+F:	configs/boston64r2_defconfig
+F:	configs/boston64r2el_defconfig

board/imgtec/malta/MAINTAINERS

@@ -3,5 +3,7 @@ M:	Paul Burton <paul.burton@imgtec.com>
 S:	Maintained
 F:	board/imgtec/malta/
 F:	include/configs/malta.h
+F:	configs/malta64_defconfig
+F:	configs/malta64el_defconfig
 F:	configs/malta_defconfig
 F:	configs/maltael_defconfig