arm64: defconfig: Drop unused K3 SoC specific options

With [1] integrated and all users of the config symbols removed, we
can safely remove the options from defconfig.

[1] https://patchwork.kernel.org/project/linux-arm-kernel/patch/20201026170624.24241-1-nm@ti.com/Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20210107132228.6577-1-nm@ti.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/configs/defconfig

@@ -991,8 +991,6 @@ CONFIG_ARCH_TEGRA_210_SOC=y
 CONFIG_ARCH_TEGRA_186_SOC=y
 CONFIG_ARCH_TEGRA_194_SOC=y
 CONFIG_ARCH_TEGRA_234_SOC=y
-CONFIG_ARCH_K3_AM6_SOC=y
-CONFIG_ARCH_K3_J721E_SOC=y
 CONFIG_TI_SCI_PM_DOMAINS=y
 CONFIG_EXTCON_PTN5150=m
 CONFIG_EXTCON_USB_GPIO=y