mmc: sdhci: Avoid leaking kernel addresses

Use %pK instead of %p in debug logs so that kernel addresses don't get
leaked when debug logs are dynamically enabled.

Change-Id: I3c0df8a8db6643ab547d8599dd03b54030f76ece
Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org>