meta: use ln -rs instead of lnr

lnr is a script in oe-core that creates relative symlinks, with the same
behaviour as `ln --relative --symlink`.  It was added back in 2014[1] as
not all of the supported host distributions at the time shipped
coreutils 8.16, the first release with --relative.

However the oldest coreutils release in the supported distributions is
now 8.22 in CentOS 7, so lnr can be deprecated and users switched to ln.

[1] 6ae3b85eaffd1b0b6914422e8de7c1230723157d

(From OE-Core rev: 1ca455a98de4c713f58df0a537d4c982d256cd68)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-kernel/kmod/kmod_git.bb

@@ -19,9 +19,9 @@ do_install:append () {
         install -dm755 ${D}${base_bindir}
         install -dm755 ${D}${base_sbindir}
         # add symlinks to kmod
-        lnr ${D}${base_bindir}/kmod ${D}${base_bindir}/lsmod
+        ln -rs ${D}${base_bindir}/kmod ${D}${base_bindir}/lsmod
         for tool in insmod rmmod depmod modinfo modprobe; do
-                lnr ${D}${base_bindir}/kmod ${D}${base_sbindir}/${tool}
+                ln -rs ${D}${base_bindir}/kmod ${D}${base_sbindir}/${tool}
         done
         # configuration directories
         install -dm755 ${D}${nonarch_base_libdir}/depmod.d

meta/recipes-kernel/linux/kernel-devsrc.bb

@@ -48,7 +48,7 @@ do_install() {
     mkdir -p ${D}/usr/src
     (
 	cd ${D}/usr/src
-	lnr ${D}${KERNEL_BUILD_ROOT}${KERNEL_VERSION}/source kernel
+	ln -rs ${D}${KERNEL_BUILD_ROOT}${KERNEL_VERSION}/source kernel
     )
 
     # for on target purposes, we unify build and source