ANDROID: mmc: sdio: Add concept of an 'embedded' SDIO device.

This is required to support chips which use SDIO for signaling/
communication but do not implement the various card enumeration registers
as required for full SD / SDIO cards.

mmc: sdio: Fix bug where we're freeing the CIS tables we never allocated when using EMBEDDED_SDIO
mmc: Add max_blksize to embedded SDIO data

Change-Id: Ibff2e3e991e5522f55ec8c6edc25ed09f2553736
Signed-off-by: San Mehat <san@google.com>

[AmitP: Rebased the original commit to align with the upstream commit
        5fc3d80e ("mmc: sdio: don't use rocr to check if the card could support UHS mode")

        Also folded following android-4.9 commit changes into this patch
        d775b65ecaf6 ("ANDROID: mmc: core: Remove stray CONFIG_EXPERIMENTAL dependencies")]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>