MAINTAINERS: Remove non-existent VAS file

The file arch/powerpc/include/uapi/asm/vas.h was considered but
never merged and should be removed from the MAINTAINERS file.

While here, add missing email address.

Reported-by: Joe Perches <joe@perches.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

MAINTAINERS

@@ -7385,13 +7385,12 @@ S:	Supported
 F:	drivers/net/ethernet/ibm/ibmvnic.*
 
 IBM Power Virtual Accelerator Switchboard
-M:	Sukadev Bhattiprolu
+M:	Sukadev Bhattiprolu <sukadev@linux.ibm.com>
 L:	linuxppc-dev@lists.ozlabs.org
 S:	Supported
 F:	arch/powerpc/platforms/powernv/vas*
 F:	arch/powerpc/platforms/powernv/copy-paste.h
 F:	arch/powerpc/include/asm/vas.h
-F:	arch/powerpc/include/uapi/asm/vas.h
 
 IBM Power Virtual Ethernet Device Driver
 M:	Thomas Falcon <tlfalcon@linux.ibm.com>