powerpc: Drop orphaned VAS MAINTAINERS entry

The MAINTAINERS entry for VAS (Virtual Accelerator Switchboard) no
longer has any maintainers, it just points to linuxppc-dev, since commit
6049606 ("powerpc: Update MAINTAINERS for ibmvnic and VAS").

So just drop the VAS entry, all the paths are already covered by the
main powerpc entry, ie. the output of get_maintainer.pl is unchanged.

Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: mpe

MAINTAINERS

@@ -9789,13 +9789,6 @@ L:	[email protected]
 S:	Supported
 F:	drivers/net/ethernet/ibm/ibmvnic.*
 
-IBM Power Virtual Accelerator Switchboard
-L:	[email protected]
-S:	Supported
-F:	arch/powerpc/include/asm/vas.h
-F:	arch/powerpc/platforms/powernv/copy-paste.h
-F:	arch/powerpc/platforms/powernv/vas*
-
 IBM Power Virtual Ethernet Device Driver
 M:	Nick Child <[email protected]>
 L:	[email protected]