ltp: Reinstate 'hanging' tests for evaluation

We think we've found the root cause of the ltp hangs as a cgroup kernel
fs bug introduced in 5.1 and now fixed in linux-yocto. Reinstate these tests
and see if any issues recur.

(From OE-Core rev: 59d0df4ee3448ce5d5bcc03008f3e239003f9d79)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/ltp/ltp/disable_hanging_tests.patch

@@ -1,45 +0,0 @@
-This patch disables tests which we've found "hang" on our infrastructure.
-
-cgroup_xattr:
-https://autobuilder.yoctoproject.org/typhoon/#/builders/95/builds/1926 (x86)
-https://autobuilder.yoctoproject.org/typhoon/#/builders/95/builds/1898 (x86)
-https://autobuilder.yoctoproject.org/typhoon/#/builders/95/builds/1916 (x86)
-
-proc01:
-https://autobuilder.yoctoproject.org/typhoon/#/builders/96/builds/1748 (arm)
-https://autobuilder.yoctoproject.org/typhoon/#/builders/96/builds/1781 (arm)
-(in the latter was trying to read /proc/kmsg)
-(the above test looks horrible anyway)
-
-Upstream-Status: Inappropriate [OE Configuration]
-Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
-
-Index: git/runtest/controllers
-===================================================================
---- git.orig/runtest/controllers
-+++ git/runtest/controllers
-@@ -352,8 +352,6 @@ cpuset_memory_spread	cpuset_memory_sprea
- 
- cpuset_regression_test cpuset_regression_test.sh
- 
--cgroup_xattr	cgroup_xattr
--
- pids_1_1 pids.sh 1 1 0
- pids_1_2 pids.sh 1 2 0
- pids_1_10 pids.sh 1 10 0
-Index: git/runtest/fs
-===================================================================
---- git.orig/runtest/fs
-+++ git/runtest/fs
-@@ -64,11 +64,6 @@ writetest01	writetest
- #Also run the fs_di (Data Integrity tests)
- fs_di fs_di -d $TMPDIR
- 
--# Read every file in /proc. Not likely to crash, but does enough
--# to disturb the kernel. A good kernel latency killer too.
--# Was not sure why it should reside in runtest/crashme and won't get tested ever
--proc01 proc01 -m 128
--
- read_all_dev read_all -d /dev -p -q -r 3
- read_all_proc read_all -d /proc -q -r 3
- read_all_sys read_all -d /sys -q -r 3

meta/recipes-extended/ltp/ltp_20210524.bb

@@ -31,7 +31,6 @@ SRCREV = "0fb171f2beddaf64bd27597577c206c0f892b3cd"
 
 SRC_URI = "git://github.com/linux-test-project/ltp.git \
            file://0001-Remove-OOM-tests-from-runtest-mm.patch \
-           file://disable_hanging_tests.patch \
            "
 
 S = "${WORKDIR}/git"