WindCharger: Backport accept_ra=2 support to kernel.

This is based on the infradead patch as can be found here:
http://git.infradead.org/linux-mtd.git/commit/65e9b62d4503849b10bedfc29bff0473760cc597

This addresses b/20558905

Change-Id: I5016b9153c796304cb2794f013383b92e6b336ff
1 file changed