mt76: mt76_connac: set is_mt7902 inside is_mt7921

[hmtheboy154]

So we don't have to set is_mt7902 everytime we see is_mt7921. Which will help us inherit all of common mt792x codes like mt7920 & mt7922.

[dubhater]

What if some function needs to do one thing for 7921 and something else for 7902?

[hmtheboy154]

What if some function needs to do one thing for 7921 and something else for 7902?

Beside TX/RX handling & firmware handling, I think we can inherit all of 7921 code. On the Android BSP code it actually show that 7902 inherit a lot from 7921 (like 7922) to the point that you can see things like this:
https://github.com/MiCode/MTK_kernel_modules/blob/bsp-rodin-v-oss/connectivity/wlan/core/gen4-mt79xx/chips/mt7961/mt7961.c#L60
https://github.com/MiCode/MTK_kernel_modules/blob/bsp-rodin-v-oss/connectivity/wlan/core/gen4-mt79xx/include/chips/mt7961.h#L57
https://github.com/MiCode/MTK_kernel_modules/blob/bsp-rodin-v-oss/connectivity/wlan/core/gen4-mt79xx/chips/mt7961/hal_wfsys_reset_mt7961.c#L59

And firmware handling differences is just because mt7902 have support for Zigbee so it need an extra switch for BT/Zigbee which mean we only need RX/TX handling which I sorta did at #11