convert flash params to int

devices/qemu-armv7l/default.nix

@@ -71,7 +71,7 @@
         entryPoint = lim.parseInt "0x00010000";
         rootDevice = "/dev/mtdblock0";
 
-        flash.eraseBlockSize = "65536"; # c.f. pkgs/mips-vm/mips-vm.sh
+        flash.eraseBlockSize = 65536; # c.f. pkgs/mips-vm/mips-vm.sh
         networkInterfaces =
           let inherit (config.system.service.network) link;
           in {