soc/amd/cezanne,mendocino,picasso/uart: use write16p to avoid typecasts

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I6e743068dfcf9d393096f775759181af1a1c470d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67979
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>

src/soc/amd/cezanne/uart.c

@@ -37,7 +37,7 @@ uintptr_t get_uart_base(unsigned int idx)
 
 void clear_uart_legacy_config(void)
 {
-	write16((void *)FCH_LEGACY_UART_DECODE, 0);
+	write16p(FCH_LEGACY_UART_DECODE, 0);
 }
 
 void set_uart_config(unsigned int idx)

src/soc/amd/mendocino/uart.c

@@ -49,7 +49,7 @@ uintptr_t get_uart_base(unsigned int idx)
 
 void clear_uart_legacy_config(void)
 {
-	write16((void *)FCH_LEGACY_UART_DECODE, 0);
+	write16p(FCH_LEGACY_UART_DECODE, 0);
 }
 
 void set_uart_config(unsigned int idx)

src/soc/amd/picasso/uart.c

@@ -45,7 +45,7 @@ uintptr_t get_uart_base(unsigned int idx)
 
 void clear_uart_legacy_config(void)
 {
-	write16((void *)FCH_LEGACY_UART_DECODE, 0);
+	write16p(FCH_LEGACY_UART_DECODE, 0);
 }
 
 void set_uart_config(unsigned int idx)