MAINTAINERS: update arm64 Microchip entries

Krzysztof noticed that patches for arch/arm64/boot/dts/microchip were
getting lost & the listed tree was inactive.

Nicolas and I are willing to shepherd patches to Arnd, using the
existing at91 tree, so add a new entry covering
arch/arm64/boot/dts/microchip, listing us as maintainers.

Drop the tree from the existing sparx5 entry & narrow the devicetree
pattern to just sparx devices, leaving Lars, Steen and Daniel looking
after support for their SoCs.

CC: Rob Herring <[email protected]>
CC: Krzysztof Kozlowski <[email protected]>
CC: Conor Dooley <[email protected]>
CC: Nicolas Ferre <[email protected]>
CC: Claudiu Beznea <[email protected]>
CC: [email protected]
CC: Lars Povlsen <[email protected]>
CC: Steen Hegelund <[email protected]>
CC: Daniel Machon <[email protected]>
Signed-off-by: Conor Dooley <[email protected]>
Acked-by: Nicolas Ferre <[email protected]>
Acked-by: Steen Hegelund <[email protected]>
Acked-by: Claudiu Beznea <[email protected]>
Link: https://lore.kernel.org/r/20230522-wagon-stencil-a164ec39322a@wendy
Signed-off-by: Arnd Bergmann <[email protected]>

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