net: dsa: b53: split reading search entry into their own functions

net: dsa: b53: split reading search entry into their own functions

[ Upstream commit e0c476f325a8c9b961a3d446c24d3c8ecae7d186 ]

Split reading search entries into a function for each format.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20251107080749.26936-6-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>