fpga: add Microsemi IGLOO2 M2GL010T to the registry

IDCODE 0x0F8031CF (mask 0x0FFFFFFF, top nibble = revision) and IR
length 8 read from bsdl_files/m2gl010t-fg484.bsd. No proxy or IR
opcodes: IGLOO2 internal flash is programmed by playing a Libero SVF,
not via the Xilinx BSCAN-proxy SPI path, so those fields don't apply.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

fpga_registry.yaml

@@ -54,3 +54,18 @@ fpgas:
     ir_isc_disable:  0x16
     proxy_bitstream: bscan_spi_xcku040.bit
     caveats:         cclk_via_startup
+
+  # Microsemi IGLOO2 M2GL010T (M2GL-EVAL-KIT)
+  # IDCODE / IR length from bsdl_files/m2gl010t-fg484.bsd
+  #   IDCODE_REGISTER "XXXX1111100000000011000111001111" -> 0x0F8031CF
+  #   (top nibble = silicon revision, masked off). Shared die with the
+  #   SmartFusion2 M2S010, so both report the same IDCODE.
+  # No proxy: IGLOO2 internal flash is programmed by playing an SVF
+  # exported from Libero (SVF player not yet implemented), not via the
+  # Xilinx BSCAN-proxy SPI path — so the ir_*/proxy fields don't apply.
+  - name:           "Microsemi IGLOO2 M2GL010T"
+    idcode:         0x0F8031CF
+    idcode_mask:    0x0FFFFFFF
+    family:         microsemi_igloo2
+    bsdl:           m2gl010t-fg484.bsd
+    ir_length:      8