soc/amd/picasso: Use read*p

This avoids compiler warnings on 64bit builds that complains about
casting pointer to non matching integer size.

Change-Id: I29fdb73ae1c0508796a21b650bf4fd1ac6688021
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63726
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/amd/picasso/fch.c

@@ -109,7 +109,7 @@ static void sb_rfmux_config_override(void)
 
 	for (port = 0; port < USB_PD_PORT_COUNT; port++) {
 		if (cfg->usb_pd_config_override[port].rfmux_override_en) {
-			write32((void *)(USB_PD_PORT_CONTROL + PD_PORT_MUX_OFFSET(port)),
+			write32p(USB_PD_PORT_CONTROL + PD_PORT_MUX_OFFSET(port),
 				cfg->usb_pd_config_override[port].rfmux_config
 				| USB_PD_RFMUX_OVERRIDE);
 		}