Widen instruction window on WMMU

The instruction window needs to be big due to large instruction binaries
being generated.

Change-Id: I57e5b737d4accc8115f5ba309e7a92c9cb8a9b41

platforms/springbok.repl

diff --git a/platforms/springbok.repl b/platforms/springbok.repl
index 97e6c8f..7e550ca 100644
--- a/platforms/springbok.repl
+++ b/platforms/springbok.repl
@@ -37,8 +37,9 @@
 vec_controlblock : CPU.SpringbokRiscV32_ControlBlock @ sysbus 0x47000000
     core: cpu2
     iMmuNumWindows: 2
-    iMmuVirtualWindowSize: 0x10000
-    iMmuMemorySize: 0x20000
+    // TODO(b/214092253): IMEM size blow-up needs to be addressed.
+    iMmuVirtualWindowSize: 0x100000
+    iMmuMemorySize: 0x100000
     iMmuRangeStart: 0x32000000
     dMmuNumWindows: 4
     dMmuVirtualWindowSize: 0x400000