board: qrd7627a: Correct the operating voltage range.

The operating voltage range was 3.2V-4.2V which was not correct for
QRD Devices. Hence updating this range with correct values i.e
3.5V-4.2V. Accordingly the fail_safe voltage is also updated to
14% of this range.

CRs-Fixed: 377061
Change-Id: I72ab4388295437e728802e8db59d8b31feb65f9a
Signed-off-by: Krishna Vanka <kvanka@codeaurora.org>