The data_direction field in the UTP Transfer Request Descriptor is only
2 bits wide ([26:25]). UFSHCI_DATA_DIRECTION_FROM_TGT_TO_SYS was defined
as 0x10, which truncates to 0b00 (No data transfer) when stored into the
2-bit field, so every read command was described to the controller as
having no data phase. Only writes (0b01) happened to be encoded
correctly.

Define all values as 2-bit binary literals, matching the existing
RESERVED = 0b11 entry, so read is encoded as 0b10 as required by the
specification.

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