Revert "SecurityPkg: Add RPMC Index to the RpmcLib"

Revert "SecurityPkg: Add RPMC Index to the RpmcLib"

This reverts commit 6c8dd15c4ae42501438a525ec41299f365f223cb.

Based on the discussion https://edk2.groups.io/g/devel/message/67764,
this change is regarded as the feature request. But, it doesn't pass
reviewed before 202011 stable tag soft feature freeze. So, it should
not be merged into 202011 stable tag.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Nishant C Mistry <nishant.c.mistry@intel.com>
Signed-off-by: Liming Gao <gaoliming@byosoft.com.cn>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>