rtase: Refactor the rtase_check_mac_version_valid() function

Different hardware requires different configurations, but this distinction
was not made previously. Additionally, the error message was not clear
enough. Therefore, this patch will address the issues mentioned above.

Fixes: a36e9f5c ("rtase: Add support for a pci table in this module")
Signed-off-by: Justin Lai <justinlai0215@realtek.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>