imx8mq: tune strobe-dll-delay-target

mmcblk0 errors are seen with the value 5, and not seen
with value 4.

strobe-dll-delay-target is documented as such:
"Due to the time delay between CLK line and data_strobe
line, if the delay time is larger than one clock cycle,
then CLK and data_strobe line will be misaligned, read
error shows up."

BUG: 143714428
Change-Id: I9d283ec33b47291999291e546e4dbac9ac0d254c
(cherry picked from commit f51a68c561105229e0f30d2f159d1212752b57e2)
1 file changed