driver: spi_flash_w25qxxdv: remove an incorrect erase size definition

The W25QXXDV_PAGE_SIZE is not a valid erase size supported by
the flash component (section 7.2.23 - 7.2.26 of datasheet
https://www.winbond.com/resource-files/w25q16dv_revi_nov1714_web.pdf)
and it is not used by any code so remove it.

Jira: ZEP-615

Change-Id: I4315fa082d5cbceda65ae8567e0a77e2d4066ef1
Signed-off-by: Kuo-Lang Tseng <kuo-lang.tseng@intel.com>
1 file changed