net: dsa: b53: move reading ARL entries into their own function

net: dsa: b53: move reading ARL entries into their own function

[ Upstream commit 4a291fe7226736a465ddb3fa93c21fcef7162ec7 ]

Instead of duplicating the whole code iterating over all bins for
BCM5325, factor out reading and parsing the entry into its own
functions, and name it the modern one after the first chip with that ARL
format, (BCM53)95.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20251107080749.26936-3-jonas.gorski@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 8e46aacea426 ("net: dsa: b53: use same ARL search result offset for BCM5325/65")
Signed-off-by: Sasha Levin <sashal@kernel.org>