wifi: rtlwifi: Adjust rtl8192d-common for USB

A few of the shared functions need small changes for the USB driver:
- firmware loading
- efuse reading
- rate mask updating
- rf register reading
- initial gain for scanning

Also, add a few macros to wifi.h and initialise rtlhal.interfaceindex
for USB devices.

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/28100330-f421-4b85-b41b-f1045380cef2@gmail.com

wifi: rtlwifi: Clean up rtl8192d-common a bit

Improve readability:
* add empty lines
* use abs_diff in rtl92d_dm_txpower_tracking_callback_thermalmeter
* roll up repeated statements into a for loop in
rtl92d_dm_txpower_tracking_callback_thermalmeter
* shorten lines by replacing many instances of "rtlpriv->dm" with "dm"
pointer in rtl92d_dm_txpower_tracking_callback_thermalmeter
* sort some declarations by length
* refactor _rtl92d_get_txpower_writeval_by_regulatory a little
* refactor _rtl92de_readpowervalue_fromprom a little

Delete unused structs tag_dynamic_init_gain_operation_type_definition
and swat.

Simplify rtl92d_fill_h2c_cmd a little and delete a pointless wrapper
function.

Tested with a single MAC single PHY USB dongle from Aliexpress labelled
"CC&C WL-6210-V3".

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/f6acfa78-2f4e-47f1-95d4-65aa77510113@gmail.com

wifi: rtlwifi: Move code from rtl8192de to rtl8192d-common

Create the new module rtl8192d-common and move some code into it from
rtl8192de. Now the rtl8192de driver (PCI) and the new rtl8192du driver
(USB) can share some of the code.

This is mostly the code that required little effort to make it
shareable. There are a few more functions which they could share, with
more changes.

Add phy_iq_calibrate member to struct rtl_hal_ops to allow moving the
TX power tracking code from dm.c.

The other changes in this patch are adjusting whitespace, renaming some
functions, making some arrays const, and making checkpatch.pl less
unhappy.

rtl8192de is compile-tested only. rtl8192d-common is tested with the
new rtl8192du driver.

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/69c4358a-6fbf-4433-92a6-341c83e9dd48@gmail.com