selftests: kselftest_deps: Use "grep -E" instead of "egrep"

The latest version of grep claims the egrep is now obsolete so the build
now contains warnings that look like:
	egrep: warning: egrep is obsolescent; using grep -E
fix this up by moving the related file to use "grep -E" instead.

  sed -i "s/egrep/grep -E/g" `grep egrep -rwl tools/testing/selftests`

Here are the steps to install the latest grep:

  wget http://ftp.gnu.org/gnu/grep/grep-3.8.tar.gz
  tar xf grep-3.8.tar.gz
  cd grep-3.8 && ./configure && make
  sudo make install
  export PATH=/usr/local/bin:$PATH

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/kselftest_deps.sh

@@ -90,7 +90,7 @@ pass_libs=()
 pass_cnt=0
 
 # Get all TARGETS from selftests Makefile
-targets=$(egrep "^TARGETS +|^TARGETS =" Makefile | cut -d "=" -f2)
+targets=$(grep -E "^TARGETS +|^TARGETS =" Makefile | cut -d "=" -f2)
 
 # Single test case
 if [ $# -eq 2 ]