vote for msm bus bandwidth
If there is no voting for the system fabric clock, it may run at the
minimum clock speed. If system fabric is running at lower speed (than
what is needed by SDCC workload), SDCC read & write throughput numbers may be
degraded.

This patch adds the msm bus voting for bandwidth required by SDCC driver
based on card clock speed and bus width.

Changes committed:
modified:   arch/arm/include/asm/mach/mmc.h
new file:   arch/arm/mach-msm/board-storage-common-a.h
modified:   arch/arm/mach-msm/board-vigor.c
modified:   drivers/mmc/host/msm_sdcc.c
modified:   drivers/mmc/host/msm_sdcc.h