ANDROID: GKI: net: add counter for number of frames coalesced in GRO

Partial cherry picked from commit 30f30b80
("net: add a per-cpu counter for the number of frames coalesced in GRO")

Add an unused ABI alignment member to struct softnet_data.

Change-Id: I05965c0cb150947935d5977884cc4d583b37131e
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
(cherry picked from commit 30f30b80)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 154523213