oct612x: Use ccflags-y instead of EXTRA_CFLAGS. #77
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ccflags-y was added to the kernel back in 2007, in commit f77bf01425b11947eeb3b5b54. Recent kernel commit
dbd83ea09699390892e5efecddd74ae43a00f071 has now completely removed the deprecated EXTRA_CFLAGS.
Comments in Kbuild and the Makefile for the oct612x library were added back when it was created in 2013 in commit f65299e to use the newer ccflags-y based on the kernel version, but the change was never made to conditionally move away from the EXTRA_CFLAGS.
Now that the older way no longer exists, always use ccflags-y.
Resolves: #76