MAINTAINERS: update MELLANOX HARDWARE PLATFORM SUPPORT maintainers

The "MELLANOX HARDWARE PLATFORM SUPPORT" is maintained as part of the
pdx86 tree. But when Mark and I took over as new pdx86 maintainers the
"MELLANOX HARDWARE PLATFORM SUPPORT" MAINTAINERS entry was not updated.

Update the entry now.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Mark Gross <mgross@linux.intel.com>
Link: https://lore.kernel.org/r/20210216152454.11878-1-hdegoede@redhat.com

MAINTAINERS

@@ -11437,8 +11437,8 @@ Q:	https://patchwork.kernel.org/project/netdevbpf/list/
 F:	drivers/net/ethernet/mellanox/mlxfw/
 
 MELLANOX HARDWARE PLATFORM SUPPORT
-M:	Andy Shevchenko <andy@infradead.org>
-M:	Darren Hart <dvhart@infradead.org>
+M:	Hans de Goede <hdegoede@redhat.com>
+M:	Mark Gross <mgross@linux.intel.com>
 M:	Vadim Pasternak <vadimp@nvidia.com>
 L:	platform-driver-x86@vger.kernel.org
 S:	Supported