correctly assign arm64 arch for Apple M1 (#11675)

* fixing typo

* removing if statement, not needed anymore

prysm.sh

@@ -75,14 +75,11 @@ fi
 
 readonly wrapper_dir="$(dirname "$(get_realpath "${BASH_SOURCE[0]}")")/dist"
 
-# for Apple M1s
-if [ "$(uname -s)" == "Darwin" ] && [ "$(uname -m)" == "arm64" ]; then
-    arch="amd64"
-else
-    arch=$(uname -m)
-    arch=${arch/x86_64/amd64}
-    arch=${arch/aarch64/arm64}
-fi
+
+arch=$(uname -m)
+arch=${arch/x86_64/amd64}
+arch=${arch/aarch64/arm64}
+
 readonly os_arch_suffix="$(uname -s | tr '[:upper:]' '[:lower:]')-$arch"
 
 system=""