grub: create recipe for configuration

This makes use of the grub-efi-cfg bbclass that was split out to create
a grub.cfg file just like the old one.

(From OE-Core rev: eff14ba3e49d77bfc8167a19a0f58563270f2a51)

Signed-off-by: California Sullivan <california.l.sullivan@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-bsp/grub/grub-bootconf_1.00.bb

@@ -0,0 +1,29 @@
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+SUMMARY = "Basic grub.cfg for use in EFI systems"
+
+RPROVIDES_${PN} += "virtual/grub-bootconf"
+
+inherit grub-efi-cfg
+
+S = "${WORKDIR}"
+
+GRUB_CFG = "${S}/grub-bootconf"
+LABELS = "boot"
+
+ROOT ?= "root=/dev/sda2"
+
+python do_configure() {
+    bb.build.exec_func('build_efi_cfg', d)
+}
+
+do_configure[vardeps] += "APPEND ROOT"
+
+do_install() {
+	install -d ${D}/boot
+	install -d ${D}/boot/EFI
+	install -d ${D}/boot/EFI/BOOT
+	install -m 0744 grub-bootconf ${D}/boot/EFI/BOOT/grub.cfg
+}
+
+FILES_${PN} = "/boot/EFI/BOOT/grub.cfg"