MdeModulePkg SdMmcPciHcDxe: Remove redundant functions
MdeModulePkg SdMmcPciHcDxe: Remove redundant functions

The functions that are never called have been removed.
They are SdCardGetCsd and SdCardGetScr.
https://bugzilla.tianocore.org/show_bug.cgi?id=1062

Cc: Star Zeng <5c6bb72efe464613af94e84c05522a361b23844a@intel.com>
Cc: Eric Dong <fa9eeec52367040ac98013bc4b2913db170588f8@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: shenglei <bc08ecbbf1316cc766ca5aae38ff0e194af9f1cf@intel.com>
Reviewed-by: Star Zeng <5c6bb72efe464613af94e84c05522a361b23844a@intel.com>
Reviewed-by: Hao Wu <f387b71200577e27ccf5abb090fda0ddd187ec6e@intel.com>

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