mmc: sdhci: Replace SDHCI_USE_ADMA_64BIT flag

SDHCI_USE_ADMA_64BIT flag was being used by msm-3.18 kernel but now that
upstream sdhci driver has introduced support for 64-bit ADMA, it defined
new flag SDHCI_USE_64_BIT_DMA. Hence replace all the SDHCI_USE_ADMA_64BIT
references with SDHCI_USE_64_BIT_DMA flag.

Change-Id: I6a1e426c156d4ddb92bba00b5ec0cfb156d9550b
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[xiaonian@codeaurora.org: fixed trivial merge conflict]
Signed-off-by: Xiaonian Wang <xiaonian@codeaurora.org>