add ignore cases to the removed config
add ignore cases to the removed config

The config "CONFIG_EXPERIMENTAL" has not carried much meaning for a while
now and is almost always enabled by default. As agreed during the "Linux
kernel summit", it should be removed. This commit modifies the checkpatch
config file to add an removed config to the ignore cases.

Change-Id: I681ab346cdbb521de6cc098021f6838ac7f17ef6
Signed-off-by: Jihun Ahn <31fe625dd60d1475d1b18ea57157c450e67c870a@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT