mtd: nand: qcom: remove memset for clearing read register buffer

The memset in clear_read_regs is overhead. All the register data
will be filled by DMA during NAND operation so making these
register variables zero is not required.
Signed-off-by: NAbhishek Sahu <absahu@codeaurora.org>
Reviewed-by: NArchit Taneja <architt@codeaurora.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/nand/qcom_nandc.c

@@ -823,8 +823,6 @@ static void free_descs(struct qcom_nand_controller *nandc)
 static void clear_read_regs(struct qcom_nand_controller *nandc)
 {
 	nandc->reg_read_pos = 0;
-	memset(nandc->reg_read_buf, 0,
-	       MAX_REG_RD * sizeof(*nandc->reg_read_buf));
 }
 
 static void pre_command(struct qcom_nand_host *host, int command)