Add length option into ICMP packets

ICMP test does not support larger size probing currently. This
is a preliminary commit to support length parameter to config ICMP
packets size for the subsequent commit.

Bug: 277376698
Test: adb shell dumpsys connectivity --diag
(cherry picked from https://android-review.googlesource.com/q/commit:e51c81ad19f5ab3a052cab61319550023d5c0998)
Merged-In: Idf90ad716327f889630b943f8fb3452fc5bf5cfc
Change-Id: Idf90ad716327f889630b943f8fb3452fc5bf5cfc
1 file changed