Fix symlinks that escape the repository (#5278)

Building from a checkout in a directory such as "connectedhomeip2" turns
out to build certain samples' libCHIP from a parallel checkout called
"connectedhomeip". If such a checkout exists, this usually compiles, but
is quite confusing when it happens. Fix the symlinks to point within the
same repository regardless of directory name.
diff --git a/examples/lighting-app/efr32/third_party/connectedhomeip b/examples/lighting-app/efr32/third_party/connectedhomeip
index 80527d5..c866b86 120000
--- a/examples/lighting-app/efr32/third_party/connectedhomeip
+++ b/examples/lighting-app/efr32/third_party/connectedhomeip
@@ -1 +1 @@
-../../../../../connectedhomeip
\ No newline at end of file
+../../../..
\ No newline at end of file
diff --git a/examples/persistent-storage/efr32/third_party/connectedhomeip b/examples/persistent-storage/efr32/third_party/connectedhomeip
index 80527d5..c866b86 120000
--- a/examples/persistent-storage/efr32/third_party/connectedhomeip
+++ b/examples/persistent-storage/efr32/third_party/connectedhomeip
@@ -1 +1 @@
-../../../../../connectedhomeip
\ No newline at end of file
+../../../..
\ No newline at end of file
diff --git a/examples/pigweed-app/efr32/third_party/connectedhomeip b/examples/pigweed-app/efr32/third_party/connectedhomeip
index 80527d5..c866b86 120000
--- a/examples/pigweed-app/efr32/third_party/connectedhomeip
+++ b/examples/pigweed-app/efr32/third_party/connectedhomeip
@@ -1 +1 @@
-../../../../../connectedhomeip
\ No newline at end of file
+../../../..
\ No newline at end of file