Also strip out other duplicates from driver specific headers.

Ensure 'main.h' is explicitly included in 'pci.h' since the latter
uses some defines from the former.  It avoids issues like:

 from drivers/net/wireless/realtek/rtw88/rtw8822be.c:5:
 drivers/net/wireless/realtek/rtw88/pci.h:209:28: error: ‘RTK_MAX_TX_QUEUE_NUM’ undeclared here (not in a function); did you mean ‘RTK_MAX_RX_DESC_NUM’?
 209 | DECLARE_BITMAP(tx_queued, RTK_MAX_TX_QUEUE_NUM);
 | ^~~~~~~~~~~~~~~~~~~~

Fixes the following W=1 kernel build warning(s):

 drivers/net/wireless/realtek/rtw88/pci.c:1488:5: warning: no previous prototype for ‘rtw_pci_probe’ [-Wmissing-prototypes]
 1488 | int rtw_pci_probe(struct pci_dev *pdev,
 | ^~~~~~~~~~~~~
 drivers/net/wireless/realtek/rtw88/pci.c:1568:6: warning: no previous prototype for ‘rtw_pci_remove’ [-Wmissing-prototypes]
 1568 | void rtw_pci_remove(struct pci_dev *pdev)
 | ^~~~~~~~~~~~~~
 drivers/net/wireless/realtek/rtw88/pci.c:1590:6: warning: no previous prototype for ‘rtw_pci_shutdown’ [-Wmissing-prototypes]
 1590 | void rtw_pci_shutdown(struct pci_dev *pdev)
 | ^~~~~~~~~~~~~~~~

Cc: Yan-Hsuan Chuang <yhchuang@realtek.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201126133152.3211309-18-lee.jones@linaro.org