wifi: rtlwifi: rtl_usb: Use sync register writes

Currently rtl_usb performs register writes using the async
usb_submit_urb() function. This appears to work fine for the RTL8192CU,
but the RTL8192DU (soon to be supported by rtlwifi) has a problem:
it transmits everything at the 1M rate in the 2.4 GHz band. (The 5 GHz
band is still untested.)

With this patch, rtl_usb performs the register writes using the
synchronous usb_control_msg() function, and the RTL8192DU works
normally. The RTL8192CU still works.

The vendor drivers use the async writes in only one function,
rtl8192du_trigger_gpio_0 / rtl8192cu_trigger_gpio_0, which probably
doesn't even run in real life. They use sync writes everywhere else.

Also, remove "sync" and "async" from the names of the members of
struct rtl_io to avoid confusion:

write{8,16,32}_async -> write{8,16,32}
 read{8,16,32}_sync  ->  read{8,16,32}

Signed-off-by: Bitterblue Smith <[email protected]>
Acked-by: Ping-Ke Shih <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://msgid.link/[email protected]

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