Revert "Allow login on ttyS4"

This reverts commit 85bdf258c54304ee286a90795db3c1a75f1bfdbd.

Seem to be able to log in on tty4 just fine without this, so
drop.

Tested: Built and booted a witherspoon image
Change-Id: Iec0adad5404805514618eadc372a2fe9582da032
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/common/recipes-extended/shadow/shadow-securetty/securetty.patch b/common/recipes-extended/shadow/shadow-securetty/securetty.patch
deleted file mode 100644
index 6533e4a..0000000
--- a/common/recipes-extended/shadow/shadow-securetty/securetty.patch
+++ /dev/null
@@ -1,10 +0,0 @@
---- a/securetty
-+++ b/securetty
-@@ -7,6 +7,7 @@ ttyS0
- ttyS1
- ttyS2
- ttyS3
-+ttyS4
- 
- # ARM AMBA SoCs
- ttyAM0
diff --git a/common/recipes-extended/shadow/shadow-securetty_%.bbappend b/common/recipes-extended/shadow/shadow-securetty_%.bbappend
deleted file mode 100644
index 70ab435..0000000
--- a/common/recipes-extended/shadow/shadow-securetty_%.bbappend
+++ /dev/null
@@ -1,4 +0,0 @@
-FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
-
-SRC_URI += "file://securetty.patch"
-