qpnp-fg-gen3: clear RESTART_GO bit always

When FG is restarted, RESTART_GO bit is set and it is cleared
only when the first estimate is done, signalled by SOC_READY
interrupt. If SOC_READY interrupt doesn't fire for some reason,
RESTART_GO bit will not get cleared. Fix this.

Change-Id: I99261d5020f5012ba0a4e35e543458f9e7b30210
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>