when recieving PON, some eMMC tend to program spare block with init data for next power cycle. If eMMC recieved PON frequently but not actually powered off. blocks being programed became really dirty and caused performance decline. Sending cmd5 frequently could also be stress to NAND block for some eMMC. Hence bypass cmd5 to extend eMMC life cycle. Change-Id: I2cee3a048da8d4e814befd0192675d3f58cd3f90 Signed-off-by: hsuan-chih_chen <hsuan-chih_chen@asus.com>