wifi: ath11k: initialize eirp_power before use

Currently, at the end of ath11k_mac_fill_reg_tpc_info(), the
reg_tpc_info struct is populated, including the following:
	reg_tpc_info->is_psd_power = is_psd_power;
	reg_tpc_info->eirp_power = eirp_power;

Kernel test robot complains on uninitialized symbol:
drivers/net/wireless/ath/ath11k/mac.c:7949
ath11k_mac_fill_reg_tpc_info() error: uninitialized symbol 'eirp_power'.

This is because there are some code paths that never set eirp_power, so
the assignment of reg_tpc_info->eirp_power can come from an
uninitialized variable. Functionally this is OK since the eirp_power
only has meaning when is_psd_power is true, and all code paths which set
is_psd_power to true also set eirp_power. However, to keep the robot
happy, always initialize eirp_power before use.

Tested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.23

Fixes: 92425f788fee ("wifi: ath11k: fill parameters for vdev set tpc power WMI command")
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Baochen Qiang <[email protected]>
Acked-by: Jeff Johnson <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://msgid.link/[email protected]

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