regulator: cprh-kbss-regulator: initialize fuse_corner_count before use

Initialize the vreg->fuse_corner_count variable before calling
cprh_sdm845_kbss_read_fuse_data() which depends upon it.  This
ensures that correct fuse values are read instead of being
skipped and left at a default value of 0.

Change-Id: Ie04729c5c234cf098858267f55d094d3d156f505
Signed-off-by: David Collins <collinsd@codeaurora.org>