buildroot: Move to 2016.08 release

Package changes:

 - ethtool: bump to version 4.6
 - dropbear: bump version to 2016.74 (severe security bugfixes)
 - ncurses: various packaging fixes
 - i2c-tools: packaging changes
 - gcc: bump 4.9 series to 4.9.4
 - busybox: bump to version 1.25.0
 - elfutils: bump version to 0.166
 - glibc: bump default to version 2.23
 - eudev: bump version to 3.2. libgudev has moved to it's own package
 - kmod: bump version to 23
 - lvm2: bump version to 2.02.162
 - pciutils: bump to version 3.5.1

Configuration changes:

 - BR2_GLIBC_VERSION_2_23=y is now the default defconfigs that specified
   it do not require it set anymore.

 - The mambo and firenze defconfigs were regenerated to remove redundant
   information. The resulting .config should have no differences.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/palmetto_defconfig b/openpower/configs/palmetto_defconfig
index 8b75186..4b73917 100644
--- a/openpower/configs/palmetto_defconfig
+++ b/openpower/configs/palmetto_defconfig
@@ -6,7 +6,6 @@
 BR2_BINUTILS_EXTRA_CONFIG_OPTIONS="--enable-targets=powerpc64-linux"
 BR2_EXTRA_GCC_CONFIG_OPTIONS="--enable-targets=powerpc64-linux"
 BR2_TOOLCHAIN_BUILDROOT_CXX=y
-BR2_GLIBC_VERSION_2_23=y
 
 BR2_OPENPOWER_CONFIG_NAME="palmetto"
 BR2_OPENPOWER_XML_PACKAGE="palmetto-xml"
@@ -30,6 +29,7 @@
 BR2_OPENPOWER_PNOR_FILENAME="palmetto.pnor"
 
 BR2_TARGET_GENERIC_HOSTNAME="skiroot"
+
 # petitboot requirements
 BR2_ENABLE_LOCALE_PURGE=y
 BR2_ENABLE_LOCALE_WHITELIST="C en_US"