accel/qaic: Rename constant for clarity

accel/qaic: Rename constant for clarity

QAIC_MANAGE_EXT_MSG_LENGTH is ambiguous and has been confused with
QAIC_MANAGE_MAX_MSG_LENGTH. Rename it to clarify it's a wire length.

Signed-off-by: Troy Hanson <thanson@qti.qualcomm.com>
Signed-off-by: Youssef Samir <youssef.abdulrahman@oss.qualcomm.com>
Reviewed-by: Carl Vanderlip <carl.vanderlip@oss.qualcomm.com>
Reviewed-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
[jhugo: capitalize subject]
Signed-off-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Link: https://patch.msgid.link/20251022141606.3740470-1-youssef.abdulrahman@oss.qualcomm.com