[zircon][sdio]Perform tuning when setting ultra high speed

Currently on VIM2, at times, the wifi chipset does not run all the way.
This is mainly being attributed to power issues. Although not related,
switching to ultra-high speed in sdio is disabled as a safety measure
until the wifi stack is more stable. This changeset adds tuning
procedure when switching to ultra-high speed. Tuning procedure helps
determine any read delays required and the right frequency when the
ultra-high speed is re-enabled.

Test: On vim2, enabled ultra high speed and verified the wifi functionality.

Change-Id: I32f0dbafbcdde32c7d220e38a1c43fc57e492284

[zircon][sdio]Add support for core sdio

This changeset probes and initializes the sdio functions. It also
implements the rw commands(CMD52 and CMD53) for control/IO operations
on SDIO

Change-Id: I8585c064602cae6256acc3074371d887aa014252

[block][sdmmc] Correct current state flags for DATA and RCV

Change-Id: I39b07f434bf296a00b7b377e9d0e696d6298aa98

[zircon][aml-sd-emmc]Get read/write blocks working on emmc

This is part 2 of emmc work on vim2. Together with
https://fuchsia-review.googlesource.com/c/zircon/+/144353 I am able to read and write
multiple blocks on emmc on vim2. Verified things work as expected on
pixel.

Change-Id: I950d299c850292ab2ac060e53a0dc0656a3ca442

[zircon][sdhci] Move sdhci hardware details from sdmmc to sdhci layer

sdmmc code is being reused for amlogic's sdhci which does not follow the sdhci
spec. This changeset relocates the cmd info specific to sdchi from sdmmc layer
to sdhci layer.

Change-Id: I6640056e6c06ee51946f0b8be6a5b07a7beb1fd2

[zircon][sdhci] Modify sdmmc code to support amlogic sd controller

Amlogic sdhci controller does not implement sdhci spec. However it can
reuse the layers up and above sdmmc.
This changeset does the following to support amlogic sdhci:
1. Introduce a quirk which takes care of command response being off by one
for pcie sdhci controllers.
2. Move command semantics that are specific to sdhci controller from
sdmmc to sdhci layer

Change-Id: Ic5a00b537575dc7933c06561350f712578fd89b7

[dev][sdhci][sdmmc] remove iotxn and cleanup

* switch to new block protocol
* remove iotxn usage
* introduce SDMMC protocol instead of device_ioctl()
* fix PIO mode
* make tuning command less special
* fix various issues where we did not conform to the spec
* comment out bit rotted SD card support for now

Change-Id: I7b8e96d326cfe010d1a8e1355453ac89790d5498

[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[dev][sdmmc][sdhci] enable HS timing and wide bus

Change-Id: Ifaa1026da40ae1555693134a1109ff31e7f6a051

[dev][block] enable pci-sdhci and mmc

Supports generic sdhci device on pci, and add basic mmc
support to sdmmc driver.

Currently the mmc driver initializes the card to legacy
timing @ 26mhz, 1-bit data width. Transfers are done
in poll mode only.

Change-Id: I51979e02490e62010033cd3384635614a6570ba8