opal-api: Document hole in the token list
OPAL call tokens 46, 47, and 48 have been unused since the dawn of time
as far as I can tell. Document the hole so the next person to assume
it's contigious doesn't get tripped up by it.
#define OPAL_WRITE_OPPANEL 43 /* unimplemented */
#define OPAL_PCI_MAP_PE_DMA_WINDOW 44
#define OPAL_PCI_MAP_PE_DMA_WINDOW_REAL 45
+/* 46 is unused */
+/* 47 is unused */
+/* 48 is unused */
#define OPAL_PCI_RESET 49
#define OPAL_PCI_GET_HUB_DIAG_DATA 50
#define OPAL_PCI_GET_PHB_DIAG_DATA 51
