platform: msm_shared: fix value for has-slot properties

fastboot expects the values to be either "yes" or "no", so adjust the
properties so that fastboot can actually tell that we have slots.

This makes flashing to the "boot" partition possible as fastboot will
automatically pick "boot_a" or "boot_b" based on the current slot.

Test: fastboot flash boot boot.img
Change-Id: I2836b374007f0584d2f0ee19ab4ce1901488dbb8
1 file changed