ARM: dts: msm: Enable modified dynamic qos in sdhci for MSM8939

Enable modified version of dynamic Qos algorithm in sdhci
driver for MSM8939.
This improves I/O performance for 8939 based targets.

Change-Id: I618c4db88d1aca0f858068fe65c4a0399eb8db42
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Signed-off-by: Bharat Pawar <bpawar@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>