cores/cpu/ibex: Remove patch (no longer required).

litex/soc/cores/cpu/ibex/ibex_top.patch

@@ -1,12 +0,0 @@
-diff --git a/ibex_top.sv b/ibex_top.sv
-index c0148ea4e..eaf4d1533 100644
---- a/ibex_top.sv
-+++ b/ibex_top.sv
-@@ -8,6 +8,7 @@
- `endif
- 
- `include "prim_assert.sv"
-+`include "prim_ram_1p_pkg.sv"
- 
- /**
-  * Top level module of the ibex RISC-V core