arm64: defconfig: drop ext2 filesystem and redundant ext3

ext4 filesystem can mount ext2, so drop CONFIG_EXT2_FS to make builds a
bit faster.  Drop also redundant CONFIG_EXT3_FS, because it just
selectes EXT4_FS.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240221155033.44160-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Arnd Bergmann <arnd@arndb.de>