openpower/petitboot: Update package to 72928ed

Changes since last update:
- Add offb support for host kernels missing the ASPEED VGA driver.
- Add support for interface config overrides via IPMI.
- Update the display format of PNOR and BMC versions.

Signed-off-by: Sam Mendoza-Jonas <sam@mendozajonas.com>
diff --git a/openpower/package/petitboot/petitboot.mk b/openpower/package/petitboot/petitboot.mk
index 1f7fd95..5871581 100644
--- a/openpower/package/petitboot/petitboot.mk
+++ b/openpower/package/petitboot/petitboot.mk
@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-PETITBOOT_VERSION = 7460bbb60ff7070c6884b700fc6370cd58703c4b
+PETITBOOT_VERSION = 72928ed32ab3684be74e4a3b90329dee7cfa6bbb
 PETITBOOT_SITE ?= $(call github,open-power,petitboot,$(PETITBOOT_VERSION))
 PETITBOOT_DEPENDENCIES = ncurses udev host-bison host-flex lvm2
 PETITBOOT_LICENSE = GPLv2