docs/hw/falcon/io: Add missing Falcon registers UNK174[] & UNK17C
These MMIO registers were noted in rnndb/falcon.xml, although presently lack
full documentation.
UNK174[] is believed to have a length of 2 (each 0x4).
@@ -121,6 +121,9 @@ Host Falcon Present on Name Description
0x164 0x05900 UAS units UAS_CONFIG UAS configuration [falcon/data.txt]
0x168 0x05a00 UAS units UAS_FAULT_ADDR UAS MMIO fault address [falcon/data.txt]
0x16c 0x05b00 UAS units UAS_FAULT_STATUS UAS MMIO fault status [falcon/data.txt]
+0x174 0x05d00 v5+ units ??? ???
+0x178 0x05e00 v5+ units ??? ???
+0x17c 0x05f00 v5+ units ??? ???
0x180 0x06000 v3+ units CODE_INDEX :ref:`code access window addr <falcon-io-code>`
0x184 0x06100 v3+ units CODE :ref:`code access window <falcon-io-code>`
0x188 0x06200 v3+ units CODE_VIRT_ADDR :ref:`code access virt addr <falcon-io-code>`
