CI: Prevent duplicate execution of architectural test suites

In riscv-arch-test, each test-suite is independent without dependencies
on others. Current architectural tests caused some test suites, like
RV32I, to execute multiple times unnecessarily. Modify to ensure each
test runs only once, speeding up the CI process. This reduce
compliance-test execution time on my GitHub action from 10m4s to 6m53s.

.ci/riscv-tests.sh

@@ -10,11 +10,4 @@ set -x
 export PATH=`pwd`/toolchain/riscv/bin:$PATH
 
 make clean
-make arch-test RISCV_DEVICE=I || exit 1
-make arch-test RISCV_DEVICE=IM  || exit 1
-make arch-test RISCV_DEVICE=IC || exit 1
-make arch-test RISCV_DEVICE=FCZicsr || exit 1
-make arch-test RISCV_DEVICE=IZifencei || exit 1
-make arch-test RISCV_DEVICE=IZicsr || exit 1
-make arch-test RISCV_DEVICE=FZicsr || exit 1
-make arch-test RISCV_DEVICE=IMA || exit 1
+make arch-test RISCV_DEVICE=IMAFCZicsrZifencei || exit 1