MAINTAINERS: Add an entry for KVM's guest_memfd

To better reflect how guest_memfd has been maintained for the last few
years, and to prepare for significant upcoming growth and expansion, add a
dedicated MAINTAINERS entry for KVM's guest_memfd, with Paolo and myself
(Sean) as co-maintainers.

List both the KVM and KVM x86 git trees as authoritative repositories, as
any given guest_memfd change has a equal odds of hitting KVM x86 or not.

Link: https://patch.msgid.link/20260731173842.2649391-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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