[C43] add QSPI eeprom support
Test details:
flash_erase /dev/mtd0 0 0
dd if=/dev/urandom of=source bs=1k count=1
dd if=source of=/dev/mtd0 bs=1k count=1
dd if=/dev/mtd0 of=dump bs=1k count=1
md5sum source dump
Test details:
flash_erase /dev/mtd0 0 0
dd if=/dev/urandom of=source bs=1k count=1
dd if=source of=/dev/mtd0 bs=1k count=1
dd if=/dev/mtd0 of=dump bs=1k count=1
md5sum source dump