platform: msm_shared: RPMB Write performance enhancement

* Add support to support RPMB performance enhancement as per
  emmc 5.1 spec.
* Add support for rel_wr_count for UFS
* Invalidate response buffer after read result and fix error
  checking for ufs rpmb write

Change-Id: I0e0aa2a76a5b19d7b096025ad76467eb435a69b5
diff --git a/platform/msm_shared/include/sdhci.h b/platform/msm_shared/include/sdhci.h
index c0b484d..64fb2b0 100644
--- a/platform/msm_shared/include/sdhci.h
+++ b/platform/msm_shared/include/sdhci.h
@@ -102,6 +102,7 @@
 	uint64_t cmd_timeout;   /* Command timeout in us */
 	bool write_flag;        /* Write flag, for reliable write cases */
 	struct mmc_data data;   /* Data pointer */
+	uint8_t rel_write;      /* Reliable write enable flag */
 };
 
 /*