MAINTAINERS: Add maintainers for Industry Pack subsystem

Add Samuel Iglesias Gonsalvez, Jens Taprogge and Greg Kroah-Hartman as
maintainers for the Industry Pack subsystem.

Cc: Jens Taprogge <[e-mail]>
Signed-off-by: Samuel Iglesias Gonsalvez <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

MAINTAINERS

···
 S:	Maintained
 F:	drivers/usb/atm/ueagle-atm.c
 
+INDUSTRY PACK SUBSYSTEM (IPACK)
+M:	Samuel Iglesias Gonsalvez <[e-mail]>
+M:	Jens Taprogge <[e-mail]>
+M:	Greg Kroah-Hartman <[e-mail]>
+L:	[e-mail]
+W:	http://industrypack.sourceforge.net
+S:	Maintained
+F:	drivers/ipack/
+
 INTEGRITY MEASUREMENT ARCHITECTURE (IMA)
 M:	Mimi Zohar <[e-mail]>
 S:	Supported