If LDO1 is used by spi flash, then we recommend to give the ownership to
the hardware. Software just read the parameters from the efuse and set
to PMU.
Prior to this commit, we expect passing ldo_unit_t to esp_ldo driver
`ldo_unit` field. And ldo_unit_t will alias the LDO unit to values
starting from 0, e.g. LDO_UNIT_1 is actually value 0.
With this commit, esp_ldo driver `ldo_unit` field will start with 1,
which is aligned with the datasheet. So LDO_UNIT_1 is in value 1,
meanwhile setting 1 to `ldo_unit` will work as well.
