Fix the bug that HAL_NAND_Read_Page_8b and HAL_NAND_Read_SpareArea_8b cannot read data normally.

[huoxingdawang]

This PR fixed the issue #6 .

By changing the *buff = *(uint8_t *)deviceaddress; to *buff = *(__IO uint8_t *)deviceaddress; , now the data could be read correctly.

Additionally, I have signed the CLA as required by CONTRIBUTING.md.

[TOUNSTM]

ST Internal Reference: 168944