HSD #18019805663: mtd: spi-nor: issi: Add IS25WP512 device

commit 6f98c2643af510c43a9cb5e2332451c44195f0d3 from
https://github.com/altera-opensource/linux-socfpga.git

 socfpga-5.15.100-lts.

Add is25wp512 info to spi_nor_ids[] table entry.

Rename is25lp256_post_bfpt_fixups to is_post_bfpt_fixups as a
common function for all is25xx post_bfpt fixups.

Signed-off-by: Niravkumar L Rabara <niravkumar.l.rabara@intel.com>
Signed-off-by: Liwei Song <liwei.song@windriver.com>