mmc: sdhci: Avoid dumping registers when SD card removed

In rapid PIPO cases SD card gets removed in between some ongoing
read/write transaction which can lead to CRC/timeout errors which are
expected only.

In such cases avoid dumping the registers.

Change-Id: If490d4f1c598b3d2399971b5e782fda574b2e9b3
Signed-off-by: Sarthak Garg <sartgarg@codeaurora.org>