board: ARC AXS10x bump Linux kernel to 4.2.4

Linux kernel 4.2.4 now has former out of the tree patch,
see http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.2.y&id=c4e3a29030fce89272f080e7e92c162b24103736



Essentially removing the patch itself.

Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>