meta-nuvoton: add generic meta-nuvoton defconfig for npcm8xx

According to commment in https://gerrit.openbmc.org/c/openbmc/openbmc/+/57718/4
We have split out the generic meta-nuvoton defconfig change from the EVB change

Signed-off-by: Tim Lee <timlee660101@gmail.com>
Change-Id: I95a53bc4acc39bad21787c059f2e6cde24c3e43e
diff --git a/meta-nuvoton/recipes-kernel/linux/linux-nuvoton.inc b/meta-nuvoton/recipes-kernel/linux/linux-nuvoton.inc
index 13e68e5..71270a8 100644
--- a/meta-nuvoton/recipes-kernel/linux/linux-nuvoton.inc
+++ b/meta-nuvoton/recipes-kernel/linux/linux-nuvoton.inc
@@ -9,11 +9,14 @@
 KSRC ?= "git://github.com/openbmc/linux;protocol=https;branch=${KBRANCH}"
 SRC_URI = "${KSRC}"
 SRC_URI:append:npcm7xx = " file://defconfig"
+SRC_URI:append:npcm8xx = " file://npcm8xx_defconfig"
 
 LINUX_VERSION_EXTENSION ?= "-${SRCREV}"
 
 PV = "${LINUX_VERSION}+git${SRCPV}"
 
+UBOOT_MKIMAGE:append:npcm8xx = " -E -B 8"
+
 inherit kernel
 require recipes-kernel/linux/linux-yocto.inc