MAINTAINERS: Move mobiveil PCI driver entry where it belongs

Commit 92f9ccca

 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP
driver DT bindings") managed to add a MAINTAINERS entry where it does
not really belong (ie in the middle of a totally unrelated series of
entries and in the wrong alphabetical order).

Fix it.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in>