[WCNCR00163365] ate: Fix FFT cannot work on non-PC Linux platform

[Description]
Fix FFT cannot work on non-PC Linux platform

* Update the folder of raw cache from "/" to "/tmp" to make sure
all users have permissions to R/W

* Return properly in HQA_CapWiFiSpectrum()

Change-Id: I8c65d5fc158673556ed8015633300ba088ebf715
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
CR-Id: WCNCR00163365
Feature: ate
(cherry picked from commit 79df9cbca0d6cefd0f477353f505ec72579d9800)
2 files changed