Removed Spike patch from Hammer repo

Hammer now builds with ToT Spike. Current Spike ToT SHA:
d7edd7ac550dab81b84f2001793e04b663330658

Signed-off-by: Jerin Joy <joy@rivosinc.com>

Author: jerinjoy

README.md

@@ -12,12 +12,9 @@ python3 -m pip install pybind11
 ```
 * Libraries and headers from Spike
 
-The `spike.*.hammer.patch` file included in this repo has the changes to be applied to Spike to work with Hammer.
-
 In the Spike repo run:
 
 ```
-git apply <PATH_TO_HAMMER>/spike.*.hammer.patch
 mkdir build
 cd build/
 ../configure --with-isa=RV64GCV --without-boost --without-boost-asio --without-boost-regex --prefix <SPIKE INSTALL LOCATION>