qtnfmac_pcie: cleanup Pearl platform headers

Remove redundant information from Pearl platform headers.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

qtnfmac: use SPDX identifier for pcie bus layer files

Change pcie bus layer licensing information to SPDX format.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

qtnfmac_pcie: move Pearl pcie sources to pcie-specific directory

In preparation to extract common qtnfmac PCIe driver sources into a
separate file, move existing Pearl-specific pcie driver sources to pcie/
directory.

Signed-off-by: Igor Mitsyanko <igor.mitsyanko.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>