openpower/petitboot: Install new subprogram for offb

30-add-offb updates the device tree with the address of the current
framebuffer, which is required to support host kernels that do not
include the ASPEED VGA driver.

Signed-off-by: Sam Mendoza-Jonas <sam@mendozajonas.com>
diff --git a/openpower/package/petitboot/petitboot.mk b/openpower/package/petitboot/petitboot.mk
index 5871581..1736435 100644
--- a/openpower/package/petitboot/petitboot.mk
+++ b/openpower/package/petitboot/petitboot.mk
@@ -46,6 +46,8 @@
 		$(TARGET_DIR)/etc/petitboot/boot.d/
 	$(INSTALL) -D -m 0755 $(@D)/utils/hooks/90-sort-dtb \
 		$(TARGET_DIR)/etc/petitboot/boot.d/
+	$(INSTALL) -D -m 0755 $(@D)/utils/hooks/30-add-offb \
+		$(TARGET_DIR)/etc/petitboot/boot.d/
 
 	$(INSTALL) -D -m 0755 $(BR2_EXTERNAL)/package/petitboot/S14silence-console \
 		$(TARGET_DIR)/etc/init.d/