staging: csr: remove csrPanic and CSR_LOG_ASSERT and CSR_LOG_ASSERT_ENABLE

these are not called at anypoint or enabled at anyplace in the code,
remove them

Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>