wifi: rtw89: fw: use MAC source for IO offload delay command

The udelay/mdelay helpers set the command source to
RTW89_FW_CMD_OFLD_SRC_OTHER (4), which does not fit the two-bit field
RTW89_H2C_CMD_OFLD_W0_SRC (GENMASK(1, 0)). The le32_encode_bits() masks
it down to 0 (RTW89_FW_CMD_OFLD_SRC_BB), and compiler throws
__field_overflow() error. Fortunately it still works because firmware
ignores the source field for a delay command.

Use RTW89_FW_CMD_OFLD_SRC_MAC as the vendor driver does, and drop the
unused RTW89_FW_CMD_OFLD_SRC_OTHER enumerator.

Reported-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Closes: https://github.com/morrownr/rtw89/issues/111
Fixes: ae3d327515f2 ("wifi: rtw89: add IO offload support via firmware")
Signed-off-by: Chia-Yuan Li <leo.li@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260714074811.30124-1-pkshih@realtek.com

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