ARM: shmobile: defconfig: cleanup by savedefconfig

Current shmobile_defconfig is not created from savedefconfig.
Therefore, next defconfig patch will be unreadable. this patch
tidyup this issue by below command

 > make shmobile_defconfig
 > make savedefconfig
 > cp defconfig ${LINUX}/arch/arm/config/shmobile_defconfig

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
[horms: Resolved conflicts; in particular leaving CONFIG_CPUFREQ_DT enabled]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>