In AlderLakeFspBinPkg/IoT/AlderLakeN/Include/FspsUpd.h, the address for GPP_F5 is given as 0x394CE605 but if you follow GPIO_*_MUXING_CNVI_CRF_XTAL_CLKREQ_ it's 0x294ce605
Looks like the headers haven't been changed since TGL, so other headers might also be incorrect.