defconfig: 8994: WLAN SAP 5GHz mode fix for perf build

The config entry is required in the kernel for the call back funtion to
be invoked with the driver is loaded. Without this the default country
is not select. Add this config flag to perf build also.

Change-Id: I1d44d80910fdcab8abec17edaa6b506d34cf946a
Signed-off-by: Yue Ma <yuem@codeaurora.org>