Revert "net: Add back alignment for size for __alloc_skb"

This reverts commit 43e2d865c4e6509c60b19d2e43d88aba9efe5a2d.

Change-Id: Ibcb116095efc5ab02716190180c405b4faffeb8d
Signed-off-by: Sridhar Ancha <sancha@codeaurora.org>