Fix ntp service silently exits issue when the time drift was too large

The ntpd process will exit silently with "-x" startup option
when the current system time is drifted too far from the ntp
server's time (> 1000 seconds). The option was introduced to
workaround the supervisord issue which was fixed:
sonic-net#2624

We are reverting the change to use "-g" option for ntpd process:
Revert "[ntp] disable ntp time jump (sonic-net#2589)"
This reverts commit a57cb14.

Signed-off-by: Zhenggen Xu <zxu@linkedin.com>

RB=2010953
G=lnos-reviewers
R=pchaudhary,pmao,vapatil,samaity,zxu
A=

build_debian.sh

@@ -282,10 +282,6 @@ sudo mv $FILESYSTEM_ROOT/grub-pc-bin*.deb $FILESYSTEM_ROOT/$PLATFORM_DIR/x86_64-
 ## Disable kexec supported reboot which was installed by default
 sudo sed -i 's/LOAD_KEXEC=true/LOAD_KEXEC=false/' $FILESYSTEM_ROOT/etc/default/kexec
 
-## Modifty ntp default configuration: disable initial jump (add -x), and disable
-## jump when time difference is greater than 1000 seconds (remove -g).
-sudo sed -i "s/NTPD_OPTS='-g'/NTPD_OPTS='-x'/" $FILESYSTEM_ROOT/etc/default/ntp
-
 ## Fix ping tools permission so non root user can directly use them
 ## Note: this is a workaround since aufs doesn't support extended attributes
 ## Ref: https://github.com/moby/moby/issues/5650#issuecomment-303499489