ARM: shmobile: defconfig: Refresh for v6.6-rc3

  - Move CONFIG_KEXEC (moved in commit 89cde455 ("kexec:
    consolidate kexec and crash options into kernel/Kconfig.kexec")),

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/1b8aee0cfcb2fa8c6e73c67f1c85c4630d946159.1694438226.git.geert+renesas@glider.be
Link: https://lore.kernel.org/r/401e68aa456557c9e1f4d2841ae7601686699974.1695815769.git.geert+renesas@glider.be