Update to buildroot 2016.05

 - package/dropbear: Add BR2_PACKAGE_DROPBEAR_SERVER option
 - host-fakeroot: re-run autotools to fix build on ppc64le host
 - linux-firmware: Update bnx2x firmware version

Configuration changes:

 - BR2_BINUTILS_VERSION_2_26_X selects the most modern version
 - BR2_LINUX_KERNEL_CUSTOM_VERSION replaces LATEST_VERSION as upstream
   tracks a newer version than we are using
 - BR2_PACKAGE_SKIBOOT is default y if (BR2_OPENPOWER_PLATFORM && BR2_powerpc_power8)
   BR2_PACKAGE_POWERPC_UTILS is selected by petitboot
 - The BR2_TOOLCHAIN_BUILDROOT_LIBSTDCPP symbol was never upstreamed.
   It's implemented by BR2_INSTALL_LIBSTDCPP in upstream, and we don't
   have it enabled.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/palmetto_defconfig b/openpower/configs/palmetto_defconfig
index 6b7a269..05d11e2 100644
--- a/openpower/configs/palmetto_defconfig
+++ b/openpower/configs/palmetto_defconfig
@@ -5,7 +5,6 @@
 BR2_BINUTILS_EXTRA_CONFIG_OPTIONS="--enable-targets=powerpc64-linux"
 BR2_EXTRA_GCC_CONFIG_OPTIONS="--enable-targets=powerpc64-linux"
 BR2_TOOLCHAIN_BUILDROOT_CXX=y
-# BR2_TOOLCHAIN_BUILDROOT_LIBSTDCPP is not set
 BR2_GLIBC_VERSION_2_23=y
 
 BR2_OPENPOWER_CONFIG_NAME="palmetto"
@@ -30,11 +29,6 @@
 BR2_OPENPOWER_PNOR_FILENAME="palmetto.pnor"
 
 BR2_TARGET_GENERIC_HOSTNAME="skiroot"
-
-# skiboot requirements
-BR2_PACKAGE_SKIBOOT=y
-BR2_PACKAGE_SKIBOOT_EMBED_PAYLOAD=n
-
 # petitboot requirements
 BR2_ENABLE_LOCALE_PURGE=y
 BR2_ENABLE_LOCALE_WHITELIST="C en_US"
@@ -45,8 +39,10 @@
 BR2_ROOTFS_DEVICE_TABLE="../openpower/device_table.txt"
 BR2_ROOTFS_POST_BUILD_SCRIPT="../openpower/scripts/fixup-target-var"
 BR2_LINUX_KERNEL=y
-BR2_LINUX_KERNEL_LATEST_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.4.13"
 BR2_KERNEL_HEADERS_4_4=y
+BR2_BINUTILS_VERSION_2_26_X=y
 BR2_LINUX_KERNEL_PATCH="$(BR2_EXTERNAL)/linux"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="$(BR2_EXTERNAL)/configs/linux/skiroot_defconfig"
@@ -65,7 +61,6 @@
 BR2_PACKAGE_PETITBOOT=y
 BR2_PACKAGE_PETITBOOT_MTD=y
 BR2_PACKAGE_IPMITOOL=y
-BR2_PACKAGE_POWERPC_UTILS=y
 BR2_PACKAGE_MDADM=y
 BR2_TARGET_ROOTFS_CPIO_XZ=y
 BR2_TARGET_ROOTFS_INITRAMFS=y