Fixes tags need work in the iio-fixes tree

In commit

    5ec569940b43 ("iio: adc: nxp-sar-adc: fix division by zero in write_raw")

Fixes tag

has these problem(s):

- Target SHA1 does not exist

Digging through the git history it looks like it should be:

    Fixes: 4434072a893e ("iio: adc: Add the NXP SAR ADC support for the s32g2/3 platforms")