i3c: master: Add driver for Cadence IP

Add a driver for Cadence I3C master IP.
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/i3c/master/Kconfig

+config CDNS_I3C_MASTER
+	tristate "Cadence I3C master driver"
+	depends on I3C
+	depends on HAS_IOMEM
+	depends on !(ALPHA || PARISC)
+	help
+	  Enable this driver if you want to support Cadence I3C master block.

drivers/i3c/master/Makefile

+obj-$(CONFIG_CDNS_I3C_MASTER)		+= i3c-master-cdns.o