MAINTAINERS: Mark Andrew as M: for ASPEED MACHINE SUPPORT

From discussion in [1] and in-person with Joel, flip my entry from R:
to M:.

Link: https://lore.kernel.org/all/CACPK8Xe8yZLXzEQPp=1D2f0TsKA7hBZG=pHHW6U51FMpp_BiRQ@mail.gmail.com/ [1]
Cc: Joel Stanley <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Andrew Jeffery <[email protected]>
Acked-by: Joel Stanley <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

Author: amboar

MAINTAINERS

@@ -2284,7 +2284,7 @@ F:	drivers/irqchip/irq-aspeed-i2c-ic.c
 
 ARM/ASPEED MACHINE SUPPORT
 M:	Joel Stanley <[email protected]>
-R:	Andrew Jeffery <[email protected]>
+M:	Andrew Jeffery <[email protected]>
 L:	[email protected] (moderated for non-subscribers)
 L:	[email protected] (moderated for non-subscribers)
 S:	Supported