cukinia: add libgpiod-tools to RRECOMMENDS

The cukinia statement `cukinia_gpio_libgpiod` requires the `gpioinfo`
command. Alternatively, the deprecated sysfs GPIO API can be used with
`cukinia_gpio_sysfs`.

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-test/cukinia/cukinia_0.6.2.bb

@@ -15,6 +15,8 @@ S = "${WORKDIR}/git"
 
 inherit allarch
 
+RRECOMMENDS:${PN} = "libgpiod-tools"
+
 do_install () {
     install -d ${D}${sbindir}
     install -m 0755 ${S}/cukinia ${D}${sbindir}