Add Geon Kim and Team nnstreamer to codeowners

Add Geon Kim(g67.kim@samsung.com) and team nnstreamer to codeowners.

Only Modify ".github/CODEOWNERS"

Signed-off-by: Geon Kim <g67.kim@samsung.com>

Author: 14KGun

.github/CODEOWNERS

@@ -4,5 +4,4 @@
 # The lists of people and groups are for github.com
 
 # All members of nnstreamer-team are supposed to review each other
-*           @jaeyun-jung @myungjoo @jijoongmoon @again4you @leemgs @wooksong @helloahn @kparichay @dongju-chae @gichan-jang @anyj0527 @zhoonit
-
+* @nnstreamer/nnstreamer @jaeyun-jung @myungjoo @jijoongmoon @again4you @leemgs @wooksong @helloahn @kparichay @dongju-chae @gichan-jang @anyj0527 @zhoonit @14kgun