rtc: pl030: Constify amba_id table

'struct amba_id' table is not modified so can be changed to const for
more safety.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-pl030.c

···
 	amba_release_regions(dev);
 }
 
-static struct amba_id pl030_ids[] = {
+static const struct amba_id pl030_ids[] = {
 	{
 		.id	= 0x00041030,
 		.mask	= 0x000fffff,