remove 'aws-portworx' prefix in variables.tf in 210-aws-portworx-storage

[gowdhaman-j]

For the below 2 variables, we need to remove 'aws-portworx' prefix.
variable "aws-portworx_portworx_spec" {
type = string
default = ""
}
variable "aws-portworx_portworx_spec_file" {
type = string
default = ""
}

If we do not remove , then I have to have variables specific for "aws" & "azure" in my terraform.tfvars. If we remove this then we can have 'portworx_spec' & 'portworx_spec_file' in terraform.tfvars.

[indirakalagara]

@gowdhaman-j FYI fixed this in the aws-portworx bom by adding variables for the portworx specs and aws creds. Now its in line with other portworx boms like azure, hence you should be able to use the same variable names