devfreq_spdm: Handle spurious interrupts during bootup

Terminate the interrupts triggered before the intitalisation
itself.

Change-Id: I7c005134ecbdae38b58e4312f9e294f5b59c2510
Signed-off-by: Dilip Kota <dkota@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>