wifi: ath12k: Fix hal_reo_cmd_status kernel-doc

Currently a warning is reported when running:

% scripts/kernel-doc -Wall -Werror -none drivers/net/wireless/ath/ath12k/hal.h
Warning: drivers/net/wireless/ath/ath12k/hal.h:596 Enum value 'HAL_REO_CMD_RESOURCE_BLOCKED' not described in enum 'hal_reo_cmd_status'

Add the missing description of HAL_REO_CMD_RESOURCE_BLOCKED.

Link: https://patch.msgid.link/20250605-hal_reo_cmd_status-kdoc-v1-1-e59f4b814b88@oss.qualcomm.com


Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>