oct612x: Use ccflags-y instead of EXTRA_CFLAGS.

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

Author: InterLinked1

drivers/dahdi/oct612x/Kbuild

@@ -24,9 +24,6 @@ octapi_files = octdeviceapi/oct6100api/oct6100_api/oct6100_adpcm_chan.o \
 		apilib/llman/octapi_llman.o \
 		oct612x-user.o
 
-# TODO: ccflags was added in 2.6.24 in commit f77bf01425b11947eeb3b5b54. This
-# should be changed to a conditional compilation based on the Kernel Version.
-# ccflags-y := -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
-EXTRA_CFLAGS = -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
+ccflags-y := -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
 obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_OCT612X) := oct612x.o
 oct612x-objs := $(octapi_files)

drivers/dahdi/oct612x/Makefile

@@ -23,8 +23,5 @@ octapi_files = octdeviceapi/oct6100api/oct6100_api/oct6100_adpcm_chan.o \
 		apilib/largmath/octapi_largmath.o \
 		apilib/llman/octapi_llman.o
 
-# TODO: ccflags was added in 2.6.24 in commit f77bf01425b11947eeb3b5b54. This
-# should be changed to a conditional compilation based on the Kernel Version.
-# ccflags-y := -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
-EXTRA_CFLAGS = -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
+ccflags-y := -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
 lib-y := $(octapi_files)