wifi: rtw89: offload DMAC and CMAC init IO to firmware

During the initialization of DMAC and CMAC, the driver performs a
large number of consecutive register writes. Sending these I/O
requests individually over the host interface introduces significant
latency and delays the device bring-up process.

Optimize the initialization flow by wrapping the register write
sequences in mac.c and mac_be.c with rtw89_io_pack() and
rtw89_io_unpack(). This batches the operations and offloads them
to the firmware via H2C commands, which significantly accelerates
the overall initialization time.
(8852C USB2.0 AMD B450 1379 ms -> 1273 ms)

Signed-off-by: Chia-Yuan Li <leo.li@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260420034051.17666-10-pkshih@realtek.com

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