MdeModulePkg/SdMmcPciHcDxe: call SdMmcFreeTrb() to complete sync operation
MdeModulePkg/SdMmcPciHcDxe: call SdMmcFreeTrb() to complete sync operation

Currently, we complete a synchronous operation without unmapping the
DMA mappings, and free the pages using FreePages () rather than calling
EFI_PCI_IO_PROTOCOL::FreeBuffer. This is simply incorrect, but it also
breaks non-coherent DMA as well as DMA protection and/or memory encryption
so let's do it correctly and call SdMmcFreeTrb() instead.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <66d3c5fdaeea7ff1f996ad04f2c45e08ab38e2f5@linaro.org>
Reviewed-by: Hao Wu <f387b71200577e27ccf5abb090fda0ddd187ec6e@intel.com>
Reviewed-by: Star Zeng <5c6bb72efe464613af94e84c05522a361b23844a@intel.com>

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