MAINTAINERS: arm/amlogic: add designated reviewers

It's already been the case for some time that Neil, Jerome and Martin
are doing the bulk of the important reviewing.  Update MAINTAINERS to
reflect reality.

Link: https://lore.kernel.org/r/[email protected]
Cc: Neil Armstrong <[email protected]>
Cc: Jerome Brunet <[email protected]>
Cc: Martin Blumenstingl <[email protected]>
Signed-off-by: Kevin Hilman <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

Author: khilman

MAINTAINERS

@@ -1597,6 +1597,9 @@ F:	sound/soc/meson/
 
 ARM/Amlogic Meson SoC support
 M:	Kevin Hilman <[email protected]>
+R:	Neil Armstrong <[email protected]>
+R:	Jerome Brunet <[email protected]>
+R:	Martin Blumenstingl <[email protected]>
 L:	[email protected] (moderated for non-subscribers)
 L:	[email protected]
 S:	Maintained