MAINTAINERS: Remove bouncing irdma maintainer

This maintainer's email no longer works. Remove it from MAINTAINERS.

This still leaves one maintainer for the driver.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Tatyana Nikolova <tatyana.e.nikolova@intel.com>
Cc: linux-rdma@vger.kernel.org
Link: https://patch.msgid.link/20250808175601.EF0AF767@davehans-spike.ostc.intel.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>