ARM: config: Enable different CONFIG_MMC flags for sdm640

Enable various features such as clock gating, deferred resume,
paranoid_sd_init, perf profiling and ring buffer for sdm640. The ring
buffer config should only be enabled for debug builds because of perf
impact.

Change-Id: Iba5831cce301988260eee70a1c423085d321f657
Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org>