mmc: sdhci-msm: add offset to CMDQ_COMMAND_DEBUG_RAM_x registers access

Starting from MCI_VERSION 4.2.0 use a different offset for the following
registers:
PERIPH_SS_SDC1_SDCC_HC_CMDQ_COMMAND_DEBUG_RAM_n
PERIPH_SS_SDC1_SDCC_HC_CMDQ_COMMAND_DEBUG_RAM_WRAPAROUND
PERIPH_SS_SDC1_SDCC_HC_CMDQ_COMMAND_DEBUG_RAM_OVERLAP

In addition, move dump debug ram functionality to the MSM specific file.

Change-Id: I3b0f5101150de9f2c190ce69b306bd151cbb65ae
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>