Linksys ea6500-v2 have 256MB of ram. Currently we only use 128MB.
Expand the definition to use all the available RAM.

Fixes: 03e96644 ("ARM: dts: BCM5301X: Add basic DT for Linksys EA6500 V2")
Signed-off-by: Aleksey Nasibulin <alealexpro100@ya.ru>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Cc: stable@vger.kernel.org
Acked-by: Rafał Miłecki <rafal@milecki.pl>
Link: https://lore.kernel.org/r/20230712014017.28123-1-ansuelsmth@gmail.comSigned-off-by: Florian Fainelli <florian.fainelli@broadcom.com>