arm64: bcmbca: Include full family name in Kconfig

Spell out the BCA acronym to explain where these chips are coming from.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Link: https://lore.kernel.org/r/20220713145340.10599-1-zajec5@gmail.com


Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>