Remove reference to deleted gzip module

The gzip module was removed and replaced with an implementation in
toybox.  Remove the required modules reference.

Bug: 63400769
Change-Id: I032d7ddc59105b3c6fb87084983266655772756a
Test: m -j checkbuild
diff --git a/shell_and_utilities/Android.bp b/shell_and_utilities/Android.bp
index 6d35fed..9620d63 100644
--- a/shell_and_utilities/Android.bp
+++ b/shell_and_utilities/Android.bp
@@ -4,7 +4,6 @@
         "bzip2",
         "grep",
         "grep_vendor",
-        "gzip",
         "mkshrc",
         "mkshrc_vendor",
         "reboot",