mmc: msm_sdcc: add support for eMMC 4.5 HS200 mode

The following changes are required in host driver to
enable/configure the controller in HS200 mode -

1. Define new eMMC host capabilities as supported by the
host. These capabilities allows the MMC core driver to
enable HS200 timing in device.

2. After the device is set to HS200 mode, the host driver
must send tuning command CMD21 to find the optimal sampling
point for data lines.

3. Depending on the voltage range and HS200 modes supported
by the host and device, host driver must change the voltage
range of VccQ whenever the MMC core driver requests it.

4. Change the controller timing mode and MCLK frequency to
maximum frequency supported by host.

Change-Id: Iaa30778a509eb800b0193f32f85ce494610e94c3
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>