Yes, just leave the corresponding DSIHOST pins unconnected.
However, please note the information in the data sheet (Section 2.18).:
If DSI functionality is not used at all, then:
VDDDSI pin must be connected to global VDD.
VCAPDSI pin must be connected externally to VDD12DSI but the external capacitor is no more needed.
VSSDSI pin must be grounded
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/Peter
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