mt76x2: move mt76x2 source files to mt76x2 folder

Move mt76x2 and mt76x2u drivers to mt76x2 subfolder and
leave just shared code in mt76 root folder

Acked-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
38 files changed