arm64: defconfig: Enable eMMC/SD card on holi

Enable eMMC/SD card driver to be build as a loadable module
in the holi GKI defconfig file.

Change-Id: Ic13088afeaa70b9c0fddbbe03f5ca1545a1d4db5
Signed-off-by: Sarthak Garg <sartgarg@codeaurora.org>