poky: reset subtree on master HEAD(a88251b3e7)

As part of the last subtree update, I used master-next as the
subtree basis because there was a fix we needed in order to get QEMU
to pass.  I didn't realize that master-next deviated (because they use
to just have short-term patches in it).  Reset the content to the same
fix but from the master branch.

Change-Id: Ic7d2f0ac42e9da3eb263586b26ba56d8798d5bcf
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/poky/documentation/ref-manual/variables.rst b/poky/documentation/ref-manual/variables.rst
index 0dc881e..9cdcc1b 100644
--- a/poky/documentation/ref-manual/variables.rst
+++ b/poky/documentation/ref-manual/variables.rst
@@ -4048,7 +4048,7 @@
       The default value of the variable is set as follows in the
       ``meta/conf/distro/defaultsetup.conf`` file::
 
-         INHERIT_DISTRO ?= "debian devshell sstate license"
+         INHERIT_DISTRO ?= "debian devshell sstate license remove-libtool create-spdx"
 
    :term:`INHIBIT_DEFAULT_DEPS`
       Prevents the default dependencies, namely the C compiler and standard
@@ -8813,6 +8813,10 @@
       value so that executables built using the SDK also have the flags
       applied.
 
+   :term:`TARGET_DBGSRC_DIR`
+      Specifies the target path to debug source files. The default is
+      ``/usr/src/debug/${PN}/${PV}``.
+
    :term:`TARGET_FPU`
       Specifies the method for handling FPU code. For FPU-less targets,
       which include most ARM CPUs, the variable must be set to "soft". If