gpio-ctrl: update yocto override syntax

Signed-off-by: Michael Shen <gpgpgp@google.com>
Change-Id: I716b873ad2a3a7cc4437f90638081bba12bb280c
diff --git a/meta-google/recipes-google/gpio/gpio-ctrl_git.bb b/meta-google/recipes-google/gpio/gpio-ctrl_git.bb
index 8241fc7..c42b689 100644
--- a/meta-google/recipes-google/gpio/gpio-ctrl_git.bb
+++ b/meta-google/recipes-google/gpio/gpio-ctrl_git.bb
@@ -6,7 +6,7 @@
 
 SRC_URI += "file://lib.sh"
 
-RDEPENDS_${PN} = "bash"
+RDEPENDS:${PN} = "bash"
 
 do_install() {
     install -d ${D}${datadir}/gpio-ctrl