mmc: sdhci-msm: dump vendor specific registers during error

Implement dump_vendor_registers host operation to print the
vendor specific registers in addition to standard SDHC
register during error conditions.

Change-Id: I347e8f0373264574a80e460967afba6859607ac9
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
[xiaonian@codeaurora.org: fix trivial merge conflict and
add missing registers]
Signed-off-by: Xiaonian Wang <xiaonian@codeaurora.org>