icnss2: Avoid calibration during SSR of WCN6750

Send Calibration mode to FW only at the time of cold
boot. At the time of SSR Calibration mode will not be
sent.

Change-Id: Idf7016384937433480f62d0912e5e3dcf76f4e44
Signed-off-by: Naman Padhiar <npadhiar@codeaurora.org>