driver: bbram: npcx: fix the way to clear bbram status

Bits in the BBRAM status register (BKUP_STS) are write-1-to-clear bits.
The current driver writes 0 to clear those bits, which is incorrect.
Fix it in this commit.

Signed-off-by: Jun Lin <CHLin56@nuvoton.com>

drivers/bbram/bbram_npcx.c

@@ -26,8 +26,16 @@ static int get_bit_and_reset(const struct device *dev, int mask)
 {
 	int result = DRV_STATUS(dev) & mask;
 
-	/* Clear the bit(s) */
+	/*
+	 * Clear the bit(s):
+	 *   For emulator, write 0 to clear status bit(s).
+	 *   For real chip, write 1 to clear status bit(s).
+	 */
+#ifdef CONFIG_BBRAM_NPCX_EMUL
 	DRV_STATUS(dev) &= ~mask;
+#else
+	DRV_STATUS(dev) = mask;
+#endif
 
 	return result;
 }