meta-google: google-key: Don't bring in all of gnupg

This has a measurable effect on the size of the image, removing nearly
10MB of binaries from the uncompressed size.

Change-Id: I4da1cca0ac036ef3eded48e5c64ab4ca12196264
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-phosphor/flash/google-key.bb b/meta-google/recipes-phosphor/flash/google-key.bb
index 62d54f2..f05f082 100644
--- a/meta-google/recipes-phosphor/flash/google-key.bb
+++ b/meta-google/recipes-phosphor/flash/google-key.bb
@@ -6,7 +6,7 @@
 LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/Apache-2.0;md5=89aea4e17d99a7cacdbeed46a0096b10"
 
 RDEPENDS:${PN} += "bash"
-RDEPENDS:${PN} += "gnupg"
+RDEPENDS:${PN} += "gnupg-gpg"
 
 SRC_URI += " \
  file://platforms_gbmc_bringup.gpg \