altera_qspi: add lock unlock ops

Add lock() and unlock() mtd ops to altera_qspi.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Chin Liang See <clsee@altera.com>
Reviewed-by: Marek Vasut <marex@denx.de>
1 file changed