MAINTAINERS: Update Kishon's email address in GENERIC PHY FRAMEWORK

Update Kishon's email address in GENERIC PHY FRAMEWORK maintainer
entry.

Cc: Kishon Vijay Abraham I <kishon@kernel.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Link: https://lore.kernel.org/r/20221014062424.3327-1-kishon@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>