msm: ep_pcie: Correct clkreq override value

Use unshifted value to set the clock req override value
and enable fields as the register write function already
shifts the values to the correct position.

Change-Id: I0b5dea0f6f8462363471910ffe93f8f8975e7929
Signed-off-by: Siva Kumar Akkireddi <sivaa@codeaurora.org>
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>