Update find parameter

[jianh619]

Use single quote (or backslash ) to protect * (in *.yaml) from interpretation as shell script punctuation.

I'm using Ubuntu as my dev node , but find some weird things , that when using kubectl crossplane build provider , it will prompt error

# kubectl crossplane build provider
kubectl crossplane: error: failed to build package: failed to parse package: {path:/root/go/src/github.ibm.com/jbjhuang/cloudpak-provider/package/crds/cloudpak.crossplane.io_dependencies.yaml position:4096}: Object 'Kind' is missing in '
                           '

After several round check and test , finally found it's due to first two lines in crd

# cat crds/cloudpak.crossplane.io_dependencies.yaml

---
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition

It supposes to be remoted by Makefile scripts below , but failed , at least in ubuntu env

generate:
	go generate ./...
	@find package/crds -name *.yaml -exec sed -i.sed -e '1,2d' {} \;
	@find package/crds -name *.yaml.sed -delete