rtc: pl031: constify amba_ids

The AMBA device IDs should be marked const.  Make that so.
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-pl031.c

@@ -446,7 +446,7 @@ static struct pl031_vendor_data stv2_pl031 = {
 	.irqflags = IRQF_SHARED | IRQF_COND_SUSPEND,
 };
 
-static struct amba_id pl031_ids[] = {
+static const struct amba_id pl031_ids[] = {
 	{
 		.id = 0x00041031,
 		.mask = 0x000fffff,